## Ongoing Projects

### Die Algebra der dreidimensionalen Bewegungen

Project Lead: Josef Schicho

### Algebraic Path Planning of 6R/P Manipulators [6RP_2016]

Project Lead: Jose Capco

### Algebraic Representations in Computer-Aided Design for complEx Shapes [ARCADES]

Project Lead: Josef Schicho

## Publications

### 2018

### 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.@

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},

volume = {87},

pages = {127--139},

isbn_issn = {ISSN 0747-7171},

year = {2018},

refereed = {yes},

length = {12}

}

**article**{RISC5589,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},

volume = {87},

pages = {127--139},

isbn_issn = {ISSN 0747-7171},

year = {2018},

refereed = {yes},

length = {12}

}

### Graphs with Flexible Labelings

#### G. Grasegger, J. Legerský, J. Schicho

Discrete & Computational Geometry, pp. 1-20. 2018. 1432-0444. arXiv:1708.05298. [url]@

author = {G. Grasegger and J. Legerský and J. Schicho},

title = {{Graphs with Flexible Labelings}},

language = {english},

journal = {Discrete & Computational Geometry},

pages = {1--20},

isbn_issn = {1432-0444},

year = {2018},

note = {arXiv:1708.05298},

refereed = {yes},

length = {20},

url = {https://doi.org/10.1007/s00454-018-0026-9}

}

**article**{RISC5803,author = {G. Grasegger and J. Legerský and J. Schicho},

title = {{Graphs with Flexible Labelings}},

language = {english},

journal = {Discrete & Computational Geometry},

pages = {1--20},

isbn_issn = {1432-0444},

year = {2018},

note = {arXiv:1708.05298},

refereed = {yes},

length = {20},

url = {https://doi.org/10.1007/s00454-018-0026-9}

}

### Graphs with Flexible Labelings allowing Injective Realizations

#### G. Grasegger, J. Legerský, J. Schicho

arXiv. Technical report, 2018. [url]@

author = {G. Grasegger and J. Legerský and J. Schicho},

title = {{Graphs with Flexible Labelings allowing Injective Realizations}},

language = {english},

year = {2018},

institution = {arXiv},

length = {21},

url = {https://arxiv.org/abs/1811.06709}

}

**techreport**{RISC5806,author = {G. Grasegger and J. Legerský and J. Schicho},

title = {{Graphs with Flexible Labelings allowing Injective Realizations}},

language = {english},

year = {2018},

institution = {arXiv},

length = {21},

url = {https://arxiv.org/abs/1811.06709}

}

### 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}

}

### On the Maximal Number of Real Embeddings of Spatial Minimally Rigid Graphs

#### E. Bartzos, I.Z. Emiris, J. Legerský, E. Tsigaridas

In: ISSAC '18 Proceedings of the 2018 ACM International Symposium on Symbolic and Algebraic Computation, C. Arreche (ed.), Proceedings of International Symposium on Symbolic and Algebraic Computation 2018, pp. 55-62. 2018. 978-1-4503-5550-6. [url]@

author = {E. Bartzos and I.Z. Emiris and J. Legerský and E. Tsigaridas},

title = {{On the Maximal Number of Real Embeddings of Spatial Minimally Rigid Graphs}},

booktitle = {{ISSAC '18 Proceedings of the 2018 ACM International Symposium on Symbolic and Algebraic Computation}},

language = {english},

pages = {55--62},

isbn_issn = {978-1-4503-5550-6},

year = {2018},

editor = {C. Arreche},

refereed = {yes},

length = {8},

conferencename = {International Symposium on Symbolic and Algebraic Computation 2018},

url = {https://doi.org/10.1145/3208976.3208994}

}

**inproceedings**{RISC5804,author = {E. Bartzos and I.Z. Emiris and J. Legerský and E. Tsigaridas},

title = {{On the Maximal Number of Real Embeddings of Spatial Minimally Rigid Graphs}},

booktitle = {{ISSAC '18 Proceedings of the 2018 ACM International Symposium on Symbolic and Algebraic Computation}},

language = {english},

pages = {55--62},

isbn_issn = {978-1-4503-5550-6},

year = {2018},

editor = {C. Arreche},

refereed = {yes},

length = {8},

conferencename = {International Symposium on Symbolic and Algebraic Computation 2018},

url = {https://doi.org/10.1145/3208976.3208994}

}

### Minimal non-integer alphabets allowing parallel addition

#### J. Legerský

Acta Polytechnica, Journal of Advanced Engineering 58(5), pp. 285-291. 2018. ISSN 1805-2363. [url]@

author = {J. Legerský},

title = {{Minimal non-integer alphabets allowing parallel addition}},

language = {english},

journal = {Acta Polytechnica, Journal of Advanced Engineering},

volume = {58},

number = {5},

pages = {285--291},

isbn_issn = {ISSN 1805-2363},

year = {2018},

refereed = {yes},

length = {7},

url = {https://doi.org/10.14311/AP.2018.58.0285}

}

**article**{RISC5807,author = {J. Legerský},

title = {{Minimal non-integer alphabets allowing parallel addition}},

language = {english},

journal = {Acta Polytechnica, Journal of Advanced Engineering},

volume = {58},

number = {5},

pages = {285--291},

isbn_issn = {ISSN 1805-2363},

year = {2018},

refereed = {yes},

length = {7},

url = {https://doi.org/10.14311/AP.2018.58.0285}

}

### On the maximal number of real embeddings of minimally rigid graphs in R2, R3 and S2

#### E. Bartzos, I.Z. Emiris, J. Legerský, E. Tsigaridas

arXiv. Technical report, 2018. [url]@

author = {E. Bartzos and I.Z. Emiris and J. Legerský and E. Tsigaridas},

title = {{On the maximal number of real embeddings of minimally rigid graphs in R2, R3 and S2}},

language = {english},

year = {2018},

institution = {arXiv},

length = {22},

url = {https://arxiv.org/abs/1811.12800}

}

**techreport**{RISC5810,author = {E. Bartzos and I.Z. Emiris and J. Legerský and E. Tsigaridas},

title = {{On the maximal number of real embeddings of minimally rigid graphs in R2, R3 and S2}},

language = {english},

year = {2018},

institution = {arXiv},

length = {22},

url = {https://arxiv.org/abs/1811.12800}

}

### On sets defining few ordinary circles

#### A. Lin, M. Makhul, H. N. Mojarrad, J. Schicho, K. Swanepoel, F. de Zeeuw

Discrete and Computational Geometry 59, pp. 59-87. 2018. 0179-5376.@

author = {A. Lin and M. Makhul and H. N. Mojarrad and J. Schicho and K. Swanepoel and F. de Zeeuw},

title = {{On sets defining few ordinary circles}},

language = {english},

journal = {Discrete and Computational Geometry},

volume = {59},

pages = {59--87},

isbn_issn = {0179-5376},

year = {2018},

refereed = {yes},

length = {29}

}

**article**{RISC5535,author = {A. Lin and M. Makhul and H. N. Mojarrad and J. Schicho and K. Swanepoel and F. de Zeeuw},

title = {{On sets defining few ordinary circles}},

language = {english},

journal = {Discrete and Computational Geometry},

volume = {59},

pages = {59--87},

isbn_issn = {0179-5376},

year = {2018},

refereed = {yes},

length = {29}

}

### 2017

### Planar linkages following a prescribed motion

#### M. Gallet, C. Koutschan, Z. Li, G. Regensburger, J. Schicho, N. Villamizar

Math. Comp. 87, pp. 473-506. 2017. ISSN: 1088-6842. [url]@

author = {M. Gallet and C. Koutschan and Z. Li and G. Regensburger and J. Schicho and N. Villamizar},

title = {{Planar linkages following a prescribed motion}},

language = {english},

journal = {Math. Comp.},

volume = {87},

pages = {473--506},

isbn_issn = {ISSN: 1088-6842},

year = {2017},

refereed = {yes},

length = {34},

url = {http://www.ams.org/journals/mcom/2017-86-303/S0025-5718-2016-03120-8/}

}

**article**{RISC5410,author = {M. Gallet and C. Koutschan and Z. Li and G. Regensburger and J. Schicho and N. Villamizar},

title = {{Planar linkages following a prescribed motion}},

language = {english},

journal = {Math. Comp.},

volume = {87},

pages = {473--506},

isbn_issn = {ISSN: 1088-6842},

year = {2017},

refereed = {yes},

length = {34},

url = {http://www.ams.org/journals/mcom/2017-86-303/S0025-5718-2016-03120-8/}

}

### 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/}

}

### Mobile Icosapods

#### M. Gallet, G. Nawratil, J. Schicho, J. Selig

Adv. Appl. Math. 88, pp. 1-25. 2017. ISSN: 0196-8858. [url]@

author = {M. Gallet and G. Nawratil and J. Schicho and J. Selig},

title = {{Mobile Icosapods}},

language = {english},

journal = {Adv. Appl. Math.},

volume = {88},

pages = {1--25},

isbn_issn = {ISSN: 0196-8858},

year = {2017},

refereed = {yes},

length = {25},

url = {http://dx.doi.org/10.1016/j.aam.2016.12.002}

}

**article**{RISC5411,author = {M. Gallet and G. Nawratil and J. Schicho and J. Selig},

title = {{Mobile Icosapods}},

language = {english},

journal = {Adv. Appl. Math.},

volume = {88},

pages = {1--25},

isbn_issn = {ISSN: 0196-8858},

year = {2017},

refereed = {yes},

length = {25},

url = {http://dx.doi.org/10.1016/j.aam.2016.12.002}

}

### New developments in geometry. Theory and applications

#### U. Hertrich-Jeromin, B. Jüttler, J. Schicho

Comp. Aided Geom. Des. 47, pp. 1-2. 2017. ISSN: 0167-8396. [url]@

author = {U. Hertrich-Jeromin and B. Jüttler and J. Schicho},

title = {{New developments in geometry. Theory and applications}},

language = {english},

journal = {Comp. Aided Geom. Des.},

volume = {47},

pages = {1--2},

isbn_issn = {ISSN: 0167-8396},

year = {2017},

refereed = {yes},

length = {2},

url = {http://dx.doi.org/10.1016/j.cagd.2016.08.002}

}

**article**{RISC5413,author = {U. Hertrich-Jeromin and B. Jüttler and J. Schicho},

title = {{New developments in geometry. Theory and applications}},

language = {english},

journal = {Comp. Aided Geom. Des.},

volume = {47},

pages = {1--2},

isbn_issn = {ISSN: 0167-8396},

year = {2017},

refereed = {yes},

length = {2},

url = {http://dx.doi.org/10.1016/j.cagd.2016.08.002}

}

### Liaison linkages

#### M. Gallet, G. Nawratil, J. Schicho

J. Symb. Comp. 79, pp. 65-98. 2017. ISSN: 0747-7171. [url]@

author = {M. Gallet and G. Nawratil and J. Schicho},

title = {{Liaison linkages}},

language = {english},

journal = {J. Symb. Comp.},

volume = {79},

pages = {65--98},

isbn_issn = {ISSN: 0747-7171},

year = {2017},

refereed = {yes},

length = {34},

url = {http://dx.doi.org/10.1016/j.jsc.2016.08.006}

}

**article**{RISC5414,author = {M. Gallet and G. Nawratil and J. Schicho},

title = {{Liaison linkages}},

language = {english},

journal = {J. Symb. Comp.},

volume = {79},

pages = {65--98},

isbn_issn = {ISSN: 0747-7171},

year = {2017},

refereed = {yes},

length = {34},

url = {http://dx.doi.org/10.1016/j.jsc.2016.08.006}

}

### 2016

### Algebraic Geometry methods in Kinematics: Mobile Pods

#### Matteo Gallet

Johannes Kepler University. PhD Thesis. October 2016.@

author = {Matteo Gallet},

title = {{Algebraic Geometry methods in Kinematics: Mobile Pods}},

language = {English},

year = {2016},

month = {October},

translation = {0},

school = {Johannes Kepler University},

length = {82}

}

**phdthesis**{RISC5393,author = {Matteo Gallet},

title = {{Algebraic Geometry methods in Kinematics: Mobile Pods}},

language = {English},

year = {2016},

month = {October},

translation = {0},

school = {Johannes Kepler University},

length = {82}

}

### The rational motion of minimal dual quaternion degree with prescribed trajectory

#### Zijia Li, , J. Schicho, Hans-Peter Schröcker

Comp. Aided Geom. Des. 41, pp. 1-9. 2016. ISSN: 0167-8396. [url]@

author = {Zijia Li and and J. Schicho and Hans-Peter Schröcker},

title = {{The rational motion of minimal dual quaternion degree with prescribed trajectory}},

language = {english},

journal = {Comp. Aided Geom. Des.},

volume = {41},

pages = {1--9},

isbn_issn = {ISSN: 0167-8396},

year = {2016},

refereed = {yes},

length = {9},

url = {http://dx.doi.org/10.1016/j.cagd.2015.10.002}

}

**article**{RISC5408,author = {Zijia Li and and J. Schicho and Hans-Peter Schröcker},

title = {{The rational motion of minimal dual quaternion degree with prescribed trajectory}},

language = {english},

journal = {Comp. Aided Geom. Des.},

volume = {41},

pages = {1--9},

isbn_issn = {ISSN: 0167-8396},

year = {2016},

refereed = {yes},

length = {9},

url = {http://dx.doi.org/10.1016/j.cagd.2015.10.002}

}

### A survey on the theory of bonds

#### Zijia Li , Josef Schicho, Hans-Peter Schröcker

IMA Journal of Mathematical Control and Information, pp. -. 2016. ISSN: 1471-6887. online. [url]@

author = {Zijia Li and Josef Schicho and Hans-Peter Schröcker},

title = {{A survey on the theory of bonds}},

language = {english},

journal = {IMA Journal of Mathematical Control and Information},

pages = {--},

isbn_issn = {ISSN: 1471-6887},

year = {2016},

note = {online},

refereed = {yes},

length = {20},

url = {https://doi.org/10.1093/imamci/dnw048}

}

**article**{RISC5409,author = {Zijia Li and Josef Schicho and Hans-Peter Schröcker},

title = {{A survey on the theory of bonds}},

language = {english},

journal = {IMA Journal of Mathematical Control and Information},

pages = {--},

isbn_issn = {ISSN: 1471-6887},

year = {2016},

note = {online},

refereed = {yes},

length = {20},

url = {https://doi.org/10.1093/imamci/dnw048}

}

### Duporcq pentapods

#### G. Nawratil, J. Schicho

J. Mechanisms Robotics 9, pp. -. 2016. ISSN: 1942-4302. [url]@

author = {G. Nawratil and J. Schicho},

title = {{Duporcq pentapods}},

language = {english},

journal = {J. Mechanisms Robotics},

volume = {9},

pages = {--},

isbn_issn = {ISSN: 1942-4302},

year = {2016},

refereed = {yes},

length = {0},

url = {http://mechanismsrobotics.asmedigitalcollection.asme.org/article.aspx?articleid=2579747}

}

**article**{RISC5412,author = {G. Nawratil and J. Schicho},

title = {{Duporcq pentapods}},

language = {english},

journal = {J. Mechanisms Robotics},

volume = {9},

pages = {--},

isbn_issn = {ISSN: 1942-4302},

year = {2016},

refereed = {yes},

length = {0},

url = {http://mechanismsrobotics.asmedigitalcollection.asme.org/article.aspx?articleid=2579747}

}

### 2015

### Ambiguities in a Problem in Planar Geodesy

#### Josef Schicho, Matteo Gallet

SIGMA(008), pp. 1-13. 2015. 1815-0659. [url]@

author = {Josef Schicho and Matteo Gallet},

title = {{Ambiguities in a Problem in Planar Geodesy}},

language = {english},

abstract = {This is a study of a problem in geodesy with methods from complex algebraic geometry: for a fixed number ofmeasure points and target points at unknown position in the Euclidean plane, we study the problem of determining theirrelative position when the viewing angles between target points seen from measure points are known.In particular, we determine all situations in which there is more than one solution.},

journal = {SIGMA},

number = {008},

pages = {1--13},

isbn_issn = {1815-0659},

year = {2015},

refereed = {yes},

length = {13},

url = {http://www.emis.de/journals/SIGMA/2015/008/}

}

**article**{RISC5107,author = {Josef Schicho and Matteo Gallet},

title = {{Ambiguities in a Problem in Planar Geodesy}},

language = {english},

abstract = {This is a study of a problem in geodesy with methods from complex algebraic geometry: for a fixed number ofmeasure points and target points at unknown position in the Euclidean plane, we study the problem of determining theirrelative position when the viewing angles between target points seen from measure points are known.In particular, we determine all situations in which there is more than one solution.},

journal = {SIGMA},

number = {008},

pages = {1--13},

isbn_issn = {1815-0659},

year = {2015},

refereed = {yes},

length = {13},

url = {http://www.emis.de/journals/SIGMA/2015/008/}

}