## Members

## Sebastian Falkensteiner

## Günter Landsmann

## Johannes Middeke

## Johann Mitteramskogler

## Markus Rosenkranz

## Franz Winkler

## Ongoing Projects

### Symbolic Solutions of Algebraic Differential Equations [ADE-solve]

Project Lead: Franz Winkler

### Computer Algebra for Linear Boundary Problems [CALBP]

Project Lead: Markus Rosenkranz

## Publications

### 2018

### Rational general solutions of systems of first-order algebraic partial differential equations

#### G. Grasegger, A. Lastra, J.R. Sendra, F. Winkler

J. Computational and Applied Mathematics(331), pp. 88-103. 2018. ISSN 0377-0427. [pdf]@

author = {G. Grasegger and A. Lastra and J.R. Sendra and F. Winkler},

title = {{Rational general solutions of systems of first-order algebraic partial differential equations}},

language = {english},

journal = {J. Computational and Applied Mathematics},

number = {331},

pages = {88--103},

isbn_issn = {ISSN 0377-0427},

year = {2018},

refereed = {yes},

length = {16}

}

**article**{RISC5837,author = {G. Grasegger and A. Lastra and J.R. Sendra and F. Winkler},

title = {{Rational general solutions of systems of first-order algebraic partial differential equations}},

language = {english},

journal = {J. Computational and Applied Mathematics},

number = {331},

pages = {88--103},

isbn_issn = {ISSN 0377-0427},

year = {2018},

refereed = {yes},

length = {16}

}

### Rational General Solutions of Systems of First-Order Partial Differential Equations

#### Georg Grasegger, Alberto Lastra, J. Rafael Sendra, Franz Winkler

Journal of Computational and Applied Mathematics 331, pp. 88-103. 2018. ISSN: 0377-0427.@

author = {Georg Grasegger and Alberto Lastra and J. Rafael Sendra and Franz Winkler},

title = {{Rational General Solutions of Systems of First-Order Partial Differential Equations}},

language = {english},

journal = {Journal of Computational and Applied Mathematics},

volume = {331},

pages = {88--103},

isbn_issn = {ISSN: 0377-0427},

year = {2018},

refereed = {yes},

length = {16}

}

**article**{RISC5509,author = {Georg Grasegger and Alberto Lastra and J. Rafael Sendra and Franz Winkler},

title = {{Rational General Solutions of Systems of First-Order Partial Differential Equations}},

language = {english},

journal = {Journal of Computational and Applied Mathematics},

volume = {331},

pages = {88--103},

isbn_issn = {ISSN: 0377-0427},

year = {2018},

refereed = {yes},

length = {16}

}

### Deciding the existence of rational general solutions for first-order algebraic ODEs

#### N.T. Vo, G. Grasegger, F. Winkler

Journal of Symbolic Computation(87), pp. 127-139. 2018. ISSN 0747-7171. [pdf]@

author = {N.T. Vo and G. Grasegger and F. Winkler},

title = {{Deciding the existence of rational general solutions for first-order algebraic ODEs}},

language = {english},

journal = {Journal of Symbolic Computation},

number = {87},

pages = {127--139},

isbn_issn = {ISSN 0747-7171},

year = {2018},

refereed = {yes},

length = {13}

}

**article**{RISC5838,author = {N.T. Vo and G. Grasegger and F. Winkler},

title = {{Deciding the existence of rational general solutions for first-order algebraic ODEs}},

language = {english},

journal = {Journal of Symbolic Computation},

number = {87},

pages = {127--139},

isbn_issn = {ISSN 0747-7171},

year = {2018},

refereed = {yes},

length = {13}

}

### The Number of Realizations of a Laman Graph

#### Jose Capco, Matteo Gallet, Georg Grasegger, Christoph Koutschan, Niels Lubbes, Josef Schicho

SIAM Journal on Applied Algebra and Geometry 2(1), pp. 94-125. 2018. 2470-6566. [url]@

author = {Jose Capco and Matteo Gallet and Georg Grasegger and Christoph Koutschan and Niels Lubbes and Josef Schicho},

title = {{The Number of Realizations of a Laman Graph}},

language = {english},

journal = {SIAM Journal on Applied Algebra and Geometry},

volume = {2},

number = {1},

pages = {94--125},

isbn_issn = {2470-6566},

year = {2018},

refereed = {yes},

length = {32},

url = {https://doi.org/10.1137/17M1118312}

}

**article**{RISC5700,author = {Jose Capco and Matteo Gallet and Georg Grasegger and Christoph Koutschan and Niels Lubbes and Josef Schicho},

title = {{The Number of Realizations of a Laman Graph}},

language = {english},

journal = {SIAM Journal on Applied Algebra and Geometry},

volume = {2},

number = {1},

pages = {94--125},

isbn_issn = {2470-6566},

year = {2018},

refereed = {yes},

length = {32},

url = {https://doi.org/10.1137/17M1118312}

}

### Resultants: Algebraic and Differential

#### S. McCallum, F. Winkler

Technical report no. 18-08 in RISC Report Series, Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz, Schloss Hagenberg, 4232 Hagenberg, Austria. August 2018. [pdf]@

author = {S. McCallum and F. Winkler},

title = {{Resultants: Algebraic and Differential}},

language = {english},

abstract = {This report summarises ongoing discussions of the authors on the topic of differential resultantswhich have three goals in mind. First, we aim to try to understand existing literature on thetopic. Second, we wish to formulate some interesting questions and research goals based on ourunderstanding of the literature. Third, we would like to advance the subject in one or moredirections, by pursuing some of these questions and research goals. Both authors have somewhatmore background in nondifferential, as distinct from differential, computational algebra. For thisreason, our approach to learning about differential resultants has started with a careful review ofthe corresponding theory of resultants in the purely algebraic (polynomial) case. We try, as faras possible, to adapt and extend our knowledge of purely algebraic resultants to the differentialcase. Overall, we have the hope of helping to clarify, unify and further develop the computationaltheory of differential resultants.},

number = {18-08},

year = {2018},

month = {August},

length = {21},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

**techreport**{RISC5735,author = {S. McCallum and F. Winkler},

title = {{Resultants: Algebraic and Differential}},

language = {english},

abstract = {This report summarises ongoing discussions of the authors on the topic of differential resultantswhich have three goals in mind. First, we aim to try to understand existing literature on thetopic. Second, we wish to formulate some interesting questions and research goals based on ourunderstanding of the literature. Third, we would like to advance the subject in one or moredirections, by pursuing some of these questions and research goals. Both authors have somewhatmore background in nondifferential, as distinct from differential, computational algebra. For thisreason, our approach to learning about differential resultants has started with a careful review ofthe corresponding theory of resultants in the purely algebraic (polynomial) case. We try, as faras possible, to adapt and extend our knowledge of purely algebraic resultants to the differentialcase. Overall, we have the hope of helping to clarify, unify and further develop the computationaltheory of differential resultants.},

number = {18-08},

year = {2018},

month = {August},

length = {21},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

### Differential Resultants, in Recent Advances in Algebra, Numerical Analysis and Statistics

#### S. McCallum, F. Winkler

In: Proc. Internat. Conf. on Mathematics (ICM 2018), R. Bris et al. (ed.), Proceedings of ICM 2018, pp. 1-11. Dezember 2018. Ton Duc Thang University (TDTU), Ho Chi Minh City, Vietnam, ISBN 978-2-7598-9058-3. [url] [pdf]@

author = {S. McCallum and F. Winkler},

title = {{Differential Resultants, in Recent Advances in Algebra, Numerical Analysis and Statistics}},

booktitle = {{Proc. Internat. Conf. on Mathematics (ICM 2018)}},

language = {english},

pages = {1--11},

isbn_issn = {ISBN 978-2-7598-9058-3},

year = {2018},

month = {Dezember},

editor = {R. Bris et al.},

refereed = {yes},

institution = {Ton Duc Thang University (TDTU), Ho Chi Minh City, Vietnam},

length = {11},

conferencename = {ICM 2018},

url = {http://icm2018.tdtu.edu.vn/}

}

**inproceedings**{RISC5842,author = {S. McCallum and F. Winkler},

title = {{Differential Resultants, in Recent Advances in Algebra, Numerical Analysis and Statistics}},

booktitle = {{Proc. Internat. Conf. on Mathematics (ICM 2018)}},

language = {english},

pages = {1--11},

isbn_issn = {ISBN 978-2-7598-9058-3},

year = {2018},

month = {Dezember},

editor = {R. Bris et al.},

refereed = {yes},

institution = {Ton Duc Thang University (TDTU), Ho Chi Minh City, Vietnam},

length = {11},

conferencename = {ICM 2018},

url = {http://icm2018.tdtu.edu.vn/}

}

### Computation of all rational solutions of first-order algebraic ODEs

#### N.T. Vo, G. Grasegger, F. Winkler

Advances in Applied Mathematics 98, pp. 1-24. March 2018. Elsevier, 0196-8858. [url]@

author = {N.T. Vo and G. Grasegger and F. Winkler},

title = {{Computation of all rational solutions of first-order algebraic ODEs}},

language = {english},

journal = {Advances in Applied Mathematics},

volume = {98},

pages = {1--24},

publisher = {Elsevier},

isbn_issn = {0196-8858},

year = {2018},

month = {March},

refereed = {yes},

keywords = {Ordinary diﬀerential equation, Rational solution, Algebraic function ﬁeld, Rational curve},

length = {24},

url = {https://doi.org/10.1016/j.aam.2018.03.002}

}

**article**{RISC5797,author = {N.T. Vo and G. Grasegger and F. Winkler},

title = {{Computation of all rational solutions of first-order algebraic ODEs}},

language = {english},

journal = {Advances in Applied Mathematics},

volume = {98},

pages = {1--24},

publisher = {Elsevier},

isbn_issn = {0196-8858},

year = {2018},

month = {March},

refereed = {yes},

keywords = {Ordinary diﬀerential equation, Rational solution, Algebraic function ﬁeld, Rational curve},

length = {24},

url = {https://doi.org/10.1016/j.aam.2018.03.002}

}

### Das Unendliche im mathemtischen Alltag

#### F. Winkler

In: Beiträge des 41. Internationalen Wittgenstein Symposiums, G.M. Mras, P. Weingartner, B. Ritter (ed.), Proceedings of 41. Internationales Wittgenstein Symposium, pp. 285-287. August 2018. ISSN 1022-3398. [pdf]@

author = {F. Winkler},

title = {{Das Unendliche im mathemtischen Alltag}},

booktitle = {{Beiträge des 41. Internationalen Wittgenstein Symposiums}},

language = {english},

pages = {285--287},

isbn_issn = {ISSN 1022-3398},

year = {2018},

month = {August},

editor = {G.M. Mras and P. Weingartner and B. Ritter },

refereed = {yes},

length = {3},

conferencename = {41. Internationales Wittgenstein Symposium}

}

**inproceedings**{RISC5840,author = {F. Winkler},

title = {{Das Unendliche im mathemtischen Alltag}},

booktitle = {{Beiträge des 41. Internationalen Wittgenstein Symposiums}},

language = {english},

pages = {285--287},

isbn_issn = {ISSN 1022-3398},

year = {2018},

month = {August},

editor = {G.M. Mras and P. Weingartner and B. Ritter },

refereed = {yes},

length = {3},

conferencename = {41. Internationales Wittgenstein Symposium}

}

### 2017

### Relative Reduction and Buchberger’s Algorithm in Filtered Free Modules

#### Christoph Fuerst, Alexander Levin

In: Mathematics in Computer Science, W. Koepf (ed.), pp. 1-11. 2017. 1661-8289.@

author = {Christoph Fuerst and Alexander Levin},

title = {{Relative Reduction and Buchberger’s Algorithm in Filtered Free Modules}},

booktitle = {{Mathematics in Computer Science}},

language = {english},

pages = {1--11},

isbn_issn = {1661-8289},

year = {2017},

editor = {W. Koepf},

refereed = {yes},

length = {11}

}

**inproceedings**{RISC5432,author = {Christoph Fuerst and Alexander Levin},

title = {{Relative Reduction and Buchberger’s Algorithm in Filtered Free Modules}},

booktitle = {{Mathematics in Computer Science}},

language = {english},

pages = {1--11},

isbn_issn = {1661-8289},

year = {2017},

editor = {W. Koepf},

refereed = {yes},

length = {11}

}

### An Algebraic-Geometric Method for Computing Zolotarev Polynomials

#### Georg Grasegger, N. Thieu Vo

In: Proceedings of the 2017 international symposium on symbolic and algebraic computation (ISSAC), Burr, M. (ed.), pp. 173-180. 2017. ACM Press, New York, ISBN: 978-1-4503-5064-8.@

author = {Georg Grasegger and N. Thieu Vo},

title = {{An Algebraic-Geometric Method for Computing Zolotarev Polynomials}},

booktitle = {{Proceedings of the 2017 international symposium on symbolic and algebraic computation (ISSAC)}},

language = {english},

pages = {173--180},

publisher = {ACM Press},

address = {New York},

isbn_issn = {ISBN: 978-1-4503-5064-8},

year = {2017},

editor = {Burr and M.},

refereed = {yes},

length = {8}

}

**inproceedings**{RISC5510,author = {Georg Grasegger and N. Thieu Vo},

title = {{An Algebraic-Geometric Method for Computing Zolotarev Polynomials}},

booktitle = {{Proceedings of the 2017 international symposium on symbolic and algebraic computation (ISSAC)}},

language = {english},

pages = {173--180},

publisher = {ACM Press},

address = {New York},

isbn_issn = {ISBN: 978-1-4503-5064-8},

year = {2017},

editor = {Burr and M.},

refereed = {yes},

length = {8}

}

### The number of realizations of a Laman graph

#### Jose Capco, Georg Grasegger, Matteo Gallet, Christoph Koutschan, Niels Lubbes, Josef Schicho

Research Institute for Symbolic Computation (RISC/JKU). Technical report, 2017. [url] [pdf]@

author = {Jose Capco and Georg Grasegger and Matteo Gallet and Christoph Koutschan and Niels Lubbes and Josef Schicho},

title = {{The number of realizations of a Laman graph}},

language = {english},

abstract = {Laman graphs model planar frameworks that are rigid for a general choice of distances between the vertices. There are finitely many ways, up to isometries, to realize a Laman graph in the plane. Such realizations can be seen as solutions of systems of quadratic equations prescribing the distances between pairs of points. Using ideas from algebraic and tropical geometry, we provide a recursion formula for the number of complex solutions of such systems. },

year = {2017},

institution = {Research Institute for Symbolic Computation (RISC/JKU)},

length = {42},

url = {http://www.koutschan.de/data/laman/}

}

**techreport**{RISC5418,author = {Jose Capco and Georg Grasegger and Matteo Gallet and Christoph Koutschan and Niels Lubbes and Josef Schicho},

title = {{The number of realizations of a Laman graph}},

language = {english},

abstract = {Laman graphs model planar frameworks that are rigid for a general choice of distances between the vertices. There are finitely many ways, up to isometries, to realize a Laman graph in the plane. Such realizations can be seen as solutions of systems of quadratic equations prescribing the distances between pairs of points. Using ideas from algebraic and tropical geometry, we provide a recursion formula for the number of complex solutions of such systems. },

year = {2017},

institution = {Research Institute for Symbolic Computation (RISC/JKU)},

length = {42},

url = {http://www.koutschan.de/data/laman/}

}

### Computing the number of realizations of a Laman graph

#### Jose Capco, Georg Grasegger, Matteo Gallet, Christoph Koutschan, Niels Lubbes, Josef Schicho

In: Electronic Notes in Discrete Mathematics (Proceedings of Eurocomb 2017), Vadim Lozin (ed.), Proceedings of The European Conference on Combinatorics, Graph Theory and Applications (EUROCOMB'17)61, pp. 207-213. 2017. ISSN 1571-0653. [url]@

author = {Jose Capco and Georg Grasegger and Matteo Gallet and Christoph Koutschan and Niels Lubbes and Josef Schicho},

title = {{Computing the number of realizations of a Laman graph}},

booktitle = {{Electronic Notes in Discrete Mathematics (Proceedings of Eurocomb 2017)}},

language = {english},

abstract = {Laman graphs model planar frameworks which are rigid for a general choice of distances between the vertices. There are finitely many ways, up to isometries, to realize a Laman graph in the plane. In a recent paper we provide a recursion formula for this number of realizations using ideas from algebraic and tropical geometry. Here, we present a concise summary of this result focusing on the main ideas and the combinatorial point of view.},

volume = {61},

pages = {207--213},

isbn_issn = {ISSN 1571-0653},

year = {2017},

editor = {Vadim Lozin},

refereed = {yes},

keywords = {Laman graph; minimally rigid graph; tropical geometry; euclidean embedding; graph realization},

length = {7},

conferencename = {The European Conference on Combinatorics, Graph Theory and Applications (EUROCOMB'17)},

url = {http://www.koutschan.de/data/laman/}

}

**inproceedings**{RISC5478,author = {Jose Capco and Georg Grasegger and Matteo Gallet and Christoph Koutschan and Niels Lubbes and Josef Schicho},

title = {{Computing the number of realizations of a Laman graph}},

booktitle = {{Electronic Notes in Discrete Mathematics (Proceedings of Eurocomb 2017)}},

language = {english},

abstract = {Laman graphs model planar frameworks which are rigid for a general choice of distances between the vertices. There are finitely many ways, up to isometries, to realize a Laman graph in the plane. In a recent paper we provide a recursion formula for this number of realizations using ideas from algebraic and tropical geometry. Here, we present a concise summary of this result focusing on the main ideas and the combinatorial point of view.},

volume = {61},

pages = {207--213},

isbn_issn = {ISSN 1571-0653},

year = {2017},

editor = {Vadim Lozin},

refereed = {yes},

keywords = {Laman graph; minimally rigid graph; tropical geometry; euclidean embedding; graph realization},

length = {7},

conferencename = {The European Conference on Combinatorics, Graph Theory and Applications (EUROCOMB'17)},

url = {http://www.koutschan.de/data/laman/}

}

### Validating the Formalization of Theories and Algorithms of Discrete Mathematics by the Computer-Supported Checking of Finite Models

#### Alexander Brunhuemer

Research Institute for Symbolic Computation (RISC), Johannes Kepler University, Linz, Austria. Technical report, September 2017. Bachelor Thesis. [pdf]@

author = {Alexander Brunhuemer},

title = {{Validating the Formalization of Theories and Algorithms of Discrete Mathematics by the Computer-Supported Checking of Finite Models}},

language = {english},

abstract = {The goal of this Bachelor’s thesis is the formal specification and implementation of centraltheories and algorithms in the field of discrete mathematics by using the RISC AlgorithmLanguage (RISCAL), developed at the Research Institute for Symbolic Computation (RISC).This specification language and associated software system allow the verification of specifications,by using the concept of finite model checking. Validation on finite models is intendedto serve as a foundation layer for further research on the corresponding generalized theorieson infinite models.This thesis results in a collection of specifications of exemplarily chosen formalized algorithmsof set theory, relation and function theory and graph theory. The algorithms arespecified in different ways (implicit, recursive and procedural), to emphasize the correspondingconnections between them.The evaluation and validation of implemented theories is demonstrated on Dijkstra’s algorithmfor finding a shortest path between vertices in a graph.},

year = {2017},

month = {September},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University, Linz, Austria},

length = {88},

type = {Bachelor Thesis}

}

**techreport**{RISC5485,author = {Alexander Brunhuemer},

title = {{Validating the Formalization of Theories and Algorithms of Discrete Mathematics by the Computer-Supported Checking of Finite Models}},

language = {english},

abstract = {The goal of this Bachelor’s thesis is the formal specification and implementation of centraltheories and algorithms in the field of discrete mathematics by using the RISC AlgorithmLanguage (RISCAL), developed at the Research Institute for Symbolic Computation (RISC).This specification language and associated software system allow the verification of specifications,by using the concept of finite model checking. Validation on finite models is intendedto serve as a foundation layer for further research on the corresponding generalized theorieson infinite models.This thesis results in a collection of specifications of exemplarily chosen formalized algorithmsof set theory, relation and function theory and graph theory. The algorithms arespecified in different ways (implicit, recursive and procedural), to emphasize the correspondingconnections between them.The evaluation and validation of implemented theories is demonstrated on Dijkstra’s algorithmfor finding a shortest path between vertices in a graph.},

year = {2017},

month = {September},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University, Linz, Austria},

length = {88},

type = {Bachelor Thesis}

}

### 2016

### Axiomatic Description of Gröbner Reduction

#### Christoph Fuerst

RISC, JKU Linz. PhD Thesis. December 2016. [pdf]@

author = {Christoph Fuerst},

title = {{Axiomatic Description of Gröbner Reduction}},

language = {english},

year = {2016},

month = {December},

translation = {0},

school = {RISC, JKU Linz},

length = {154}

}

**phdthesis**{RISC5388,author = {Christoph Fuerst},

title = {{Axiomatic Description of Gröbner Reduction}},

language = {english},

year = {2016},

month = {December},

translation = {0},

school = {RISC, JKU Linz},

length = {154}

}

### A solution method for autonomous first-order algebraic partial differential equations

#### G. Grasegger, A. Lastra, J.R. Sendra, F. Winkler

Journal of Computational and Applied Mathematics 300, pp. 119-133. 2016. 0377-0427. [url]@

author = {G. Grasegger and A. Lastra and J.R. Sendra and F. Winkler},

title = {{A solution method for autonomous first-order algebraic partial differential equations}},

language = {english},

journal = {Journal of Computational and Applied Mathematics},

volume = {300},

pages = {119--133},

isbn_issn = {0377-0427},

year = {2016},

refereed = {yes},

length = {15},

url = {http://dx.doi.org/10.1016/j.cam.2015.12.030}

}

**article**{RISC5202,author = {G. Grasegger and A. Lastra and J.R. Sendra and F. Winkler},

title = {{A solution method for autonomous first-order algebraic partial differential equations}},

language = {english},

journal = {Journal of Computational and Applied Mathematics},

volume = {300},

pages = {119--133},

isbn_issn = {0377-0427},

year = {2016},

refereed = {yes},

length = {15},

url = {http://dx.doi.org/10.1016/j.cam.2015.12.030}

}

### An Algebraic-Geometric Method for Computing Zolotarev Polynomials

#### G. Grasegger, N.T. Vo

Technical report no. 16-02 in RISC Report Series, Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz, Schloss Hagenberg, 4232 Hagenberg, Austria. 2016. [pdf]@

author = {G. Grasegger and N.T. Vo},

title = {{An Algebraic-Geometric Method for Computing Zolotarev Polynomials}},

language = {english},

number = {16-02},

year = {2016},

length = {17},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

**techreport**{RISC5271,author = {G. Grasegger and N.T. Vo},

title = {{An Algebraic-Geometric Method for Computing Zolotarev Polynomials}},

language = {english},

number = {16-02},

year = {2016},

length = {17},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

### An Algebraic-Geometric Method for Computing Zolotarev Polynomials — Additional Information

#### G. Grasegger

Technical report no. 16-07 in RISC Report Series, Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz, Schloss Hagenberg, 4232 Hagenberg, Austria. 2016. [pdf]@

author = {G. Grasegger},

title = {{An Algebraic-Geometric Method for Computing Zolotarev Polynomials — Additional Information}},

language = {english},

number = {16-07},

year = {2016},

length = {12},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

**techreport**{RISC5340,author = {G. Grasegger},

title = {{An Algebraic-Geometric Method for Computing Zolotarev Polynomials — Additional Information}},

language = {english},

number = {16-07},

year = {2016},

length = {12},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

### A decision algorithm for rational general solutions of first-order algebraic ODEs

#### G. Grasegger, N.T. Vo, F. Winkler

In: Proceedings XV Encuentro de Algebra Computacional y Aplicaciones (EACA 2016), Universidad de la Rioja, J. Heras and A. Romero (eds.) (ed.), pp. 101-104. 2016. 978-84-608-9024-9.@

author = {G. Grasegger and N.T. Vo and F. Winkler},

title = {{A decision algorithm for rational general solutions of first-order algebraic ODEs}},

booktitle = {{Proceedings XV Encuentro de Algebra Computacional y Aplicaciones (EACA 2016)}},

language = {english},

pages = {101--104},

isbn_issn = {978-84-608-9024-9},

year = {2016},

editor = {Universidad de la Rioja and J. Heras and A. Romero (eds.)},

refereed = {yes},

length = {4}

}

**inproceedings**{RISC5400,author = {G. Grasegger and N.T. Vo and F. Winkler},

title = {{A decision algorithm for rational general solutions of first-order algebraic ODEs}},

booktitle = {{Proceedings XV Encuentro de Algebra Computacional y Aplicaciones (EACA 2016)}},

language = {english},

pages = {101--104},

isbn_issn = {978-84-608-9024-9},

year = {2016},

editor = {Universidad de la Rioja and J. Heras and A. Romero (eds.)},

refereed = {yes},

length = {4}

}

### Representation of hypergeometric products in difference rings

#### E.D. Ocansey, C. Schneider

ACM Communications in Computer Algebra 50(4), pp. 161-163. 2016. ISSN 1932-2240 . Extended abstract of the poster presentation at ISSAC 2016. [pdf]@

author = {E.D. Ocansey and C. Schneider},

title = {{Representation of hypergeometric products in difference rings}},

language = {english},

journal = {ACM Communications in Computer Algebra},

volume = {50},

number = {4},

pages = {161--163},

isbn_issn = {ISSN 1932-2240 },

year = {2016},

note = {Extended abstract of the poster presentation at ISSAC 2016},

refereed = {yes},

length = {3}

}

**article**{RISC5316,author = {E.D. Ocansey and C. Schneider},

title = {{Representation of hypergeometric products in difference rings}},

language = {english},

journal = {ACM Communications in Computer Algebra},

volume = {50},

number = {4},

pages = {161--163},

isbn_issn = {ISSN 1932-2240 },

year = {2016},

note = {Extended abstract of the poster presentation at ISSAC 2016},

refereed = {yes},

length = {3}

}

### Rational and Algebraic Solutions of First-Order Algebraic ODEs

#### N. Thieu Vo

Technical report no. 16-11 in RISC Report Series, Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz, Schloss Hagenberg, 4232 Hagenberg, Austria. 12 2016. Thesis Dissertation. [pdf]@

author = {N. Thieu Vo},

title = {{Rational and Algebraic Solutions of First-Order Algebraic ODEs}},

language = {english},

abstract = {The main aim of this thesis is to study new algorithms for determining polynomial, rational and algebraic solutions of first-order algebraic ordinary differential equations (AODEs). The problem of determining closed form solutions of first-order AODEs has a long history, and it still plays a role in many branches of mathematics. There is a bunch of solution methods for specific classes of such ODEs. However still no decision algorithm for general first-order AODEs exists, even for seeking specific kinds of solutions such as polynomial, rational or algebraic functions. Our interests are algebraic general solutions, rational general solutions, particular rational solutions and polynomial solutions. Several algorithms for determining these kinds of solutions for first-order AODEs are presented.We approach first-order AODEs from several aspects. By considering the derivative as a new indeterminate, a first-order AODE can be viewed as a hypersurface over the ground field. Therefore tools from algebraic geometry are applicable. In particular, we use birational transformations of algebraic hypersurfaces to transform the differential equation to another one for which we hope that it is easier to solve. This geometric approach leads us to a procedure for determining an algebraic general solution of a parametrizable first-order AODE. A general solution contains an arbitrary constant. For the problem of determining a rational general solution in which the constant appears rationally, we propose a decision algorithm for the general class of first-order AODEs.The geometric method is not applicable for studying particular rational solutions. Instead, we study this kind of solutions from combinatorial and algebraic aspects. In the combinatorial consideration, poles of the coefficients of the differential equation play an important role in the estimation of candidates for poles of a rational solution and their multiplicities. An algebraic method based on algebraic function field theory is proposed to globally estimate the degree of a rational solution. A combination of these methods leads us to an algorithm for determining all rational solutions for a generic class of first-order AODEs, which covers every first-order AODEs from Kamke's collection. For polynomial solutions, the algorithm works for the general class of first-order AODEs.},

number = {16-11},

year = {2016},

month = {12},

note = {Thesis Dissertation},

length = {93},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}

**techreport**{RISC5387,author = {N. Thieu Vo},

title = {{Rational and Algebraic Solutions of First-Order Algebraic ODEs}},

language = {english},

abstract = {The main aim of this thesis is to study new algorithms for determining polynomial, rational and algebraic solutions of first-order algebraic ordinary differential equations (AODEs). The problem of determining closed form solutions of first-order AODEs has a long history, and it still plays a role in many branches of mathematics. There is a bunch of solution methods for specific classes of such ODEs. However still no decision algorithm for general first-order AODEs exists, even for seeking specific kinds of solutions such as polynomial, rational or algebraic functions. Our interests are algebraic general solutions, rational general solutions, particular rational solutions and polynomial solutions. Several algorithms for determining these kinds of solutions for first-order AODEs are presented.We approach first-order AODEs from several aspects. By considering the derivative as a new indeterminate, a first-order AODE can be viewed as a hypersurface over the ground field. Therefore tools from algebraic geometry are applicable. In particular, we use birational transformations of algebraic hypersurfaces to transform the differential equation to another one for which we hope that it is easier to solve. This geometric approach leads us to a procedure for determining an algebraic general solution of a parametrizable first-order AODE. A general solution contains an arbitrary constant. For the problem of determining a rational general solution in which the constant appears rationally, we propose a decision algorithm for the general class of first-order AODEs.The geometric method is not applicable for studying particular rational solutions. Instead, we study this kind of solutions from combinatorial and algebraic aspects. In the combinatorial consideration, poles of the coefficients of the differential equation play an important role in the estimation of candidates for poles of a rational solution and their multiplicities. An algebraic method based on algebraic function field theory is proposed to globally estimate the degree of a rational solution. A combination of these methods leads us to an algorithm for determining all rational solutions for a generic class of first-order AODEs, which covers every first-order AODEs from Kamke's collection. For polynomial solutions, the algorithm works for the general class of first-order AODEs.},

number = {16-11},

year = {2016},

month = {12},

note = {Thesis Dissertation},

length = {93},

type = {RISC Report Series},

institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},

address = {Schloss Hagenberg, 4232 Hagenberg, Austria}

}