About

SymPy Development Team

SymPy is a team project and it was developed by a lot of people.

Here is a list of contributors together with what they do, (and in some cases links to their wiki pages), where they describe in more details what they do and what they are interested in (some people didn’t want to be mentioned here, so see our repository history for a full list).

1. Ondřej Čertík: started the project in 2006, on Jan 4, 2011 passed the project leadership to Aaron Meurer
2. Fabian Pedregosa: everything, reviewing patches, releases, general advice (issues and mailinglist), GSoC 2009
3. Jurjen N.E. Bos: pretty printing and other patches
4. Mateusz Paprocki: GSoC 2007, concrete math module, integration module, new core integration, a lot of patches, general advice, new polynomial module, improvements to solvers, simplifications, patch review
5. Marc-Etienne M.Leveille: matrix patch
6. Brian Jorgensen: GSoC 2007, plotting module and related things, patches
7. Jason Gedge: GSoC 2007, geometry module, a lot of patches and fixes, new core integration
8. Robert Schwarz: GSoC 2007, polynomials module, patches
9. Pearu Peterson: new core, sympycore project, general advice (issues and mailinglist)
10. Fredrik Johansson: mpmath project and its integration in SymPy, number theory, combinatorial functions, products & summation, statistics, units, patches, documentation, general advice (issues and mailinglist)
11. Chris Wu: GSoC 2007, linear algebra module
12. Ulrich Hecht: pattern matching and other patches
13. Goutham Lakshminarayan: number theory functions
14. David Lawrence: GHOP, Mathematica parser, square root denesting
15. Jaroslaw Tworek: GHOP, sympify AST implementation, sqrt() refactoring, maxima parser and other patches
16. David Marek: GHOP, derivative evaluation patch, int(NumberSymbol) fix
17. Bernhard R. Link: documentation patch
18. Andrej Tokarčík: GHOP, python printer
19. Or Dvory: GHOP, documentation
20. Saroj Adhikari: bug fixes
21. Pauli Virtanen: bug fix
22. Robert Kern: bug fix, common subexpression elimination
23. James Aspnes: bug fixes
24. Nimish Telang: multivariate lambdas
25. Abderrahim Kitouni: pretty printing + complex expansion bug fixes
26. Pan Peng: ode solvers patch
27. Friedrich Hagedorn: many bug fixes, refactorings and new features added
28. Elrond der Elbenfuerst: pretty printing fix
29. Rizgar Mella: BBP formula for pi calculating algorithm
30. Felix Kaiser: documentation + whitespace testing patches
31. Roberto Nobrega: several pretty printing patches
32. David Roberts: latex printing patches
33. Sebastian Krämer: implemented lambdify/numpy/mpmath cooperation, bug fixes, refactoring, lambdifying of matrices, large printing refactoring and bugfixes
34. Vinzent Steinberg: docstring patches, a lot of bug fixes, nsolve (nonlinear equation systems solver), compiling functions to machine code, patches review
35. Riccardo Gori: improvements and speedups to matrices, many bug fixes
36. Case Van Horsen: implemented optional support for gmpy in mpmath
37. Štěpán Roučka: a lot of bug fixes all over sympy (matrix, simplification, limits, series, ...)
38. Ali Raza Syed: pretty printing/isympy on windows fix
39. Stefano Maggiolo: many bug fixes, polishings and improvements
40. Robert Cimrman: matrix patches
41. Bastian Weber: latex printing patches
42. Sebastian Krause: match patches
43. Sebastian Kreft: latex printing patches, Dirac delta function, other fixes
44. Dan (coolg49964): documentation fixes
45. Alan Bromborsky: geometric algebra modules
46. Boris Timokhin: matrix fixes
47. Robert (average.programmer): initial piecewise function patch
48. Andy R. Terrel: piecewise function polishing and other patches
49. Hubert Tsang: LaTeX printing fixes
50. Konrad Meyer: policy patch
51. Henrik Johansson: matrix zero finder patch
52. Priit Laes: line integrals, cleanups in ODE, tests added
53. Freddie Witherden: trigonometric simplifications fixes, LaTeX printer improvements
54. Brian E. Granger: second quantization physics module
55. Andrew Straw: lambdify() improvements
56. Kaifeng Zhu: factorint() fix
57. Ted Horst: Basic.__call__() fix, pretty printing fix
58. Akshay Srinivasan: printing fix, improvements to integration
59. Aaron Meurer: ODE solvers (GSoC 2009), The Risch Algorithm for integration (GSoC 2010), other fixes, project leader as of Jan 4, 2011
60. Barry Wardell: implement series as function, several tests added
61. Tomasz Buchert: ccode printing fixes, code quality concerning exceptions, documentation
62. Vinay Kumar: polygamma tests
63. Johann Cohen-Tanugi: commutative diff tests
64. Jochen Voss: a test for the @cachit decorator and several other fixes
65. Luke Peterson: improve solve() to handle Derivatives
66. Chris Smith: improvements to solvers, many bug fixes, documentation and test improvements
67. Thomas Sidoti: MathML printer improvements
68. Florian Mickler: reimplementation of convex_hull, several geometry module fixes
69. Nicolas Pourcelot: Infinity comparison fixes, latex fixes
70. Ben Goodrich: Matrix.jacobian() function improvements and fixes
71. Toon Verstraelen: code generation module, latex printing improvements
72. Ronan Lamy: test coverage script; limit, expansion and other fixes and improvements; cleanup
73. James Abbatiello: fixes tests on windows
74. Ryan Krauss: fixes could_extract_minus_sign(), latex fixes and improvements
75. Bill Flynn: substitution fixes
76. Jorn Baayen: improvements to piecewise functions and latex printing, bug fixes
77. Eh Tan: improve trigonometric simplification
78. Renato Coutinho: derivative improvements
79. Oscar Benjamin: latex printer fix
80. Øyvind Jensen: implemented coupled cluster expansion and wick theorem, improvements to assumptions, bugfixes
81. Julio Idichekop Filho: indentation fixes, docstring improvements
82. Łukasz Pankowski: fix matrix multiplication with numpy scalars
83. Chu-Ching Huang: fix 3d plotting example
84. Fernando Perez: symarray() implemented
85. Raffaele De Feo: fix non-commutative expansion
86. Christian Muise: fixes to logic module
87. Matt Curry: GSoC 2010 project (symbolic quantum mechanics)
88. Kazuo Thow: cleanup pretty printing tests
89. Jezreel Ng: fix hyperbolic functions rewrite
90. Matthew Brett: fixes to lambdify
91. Addison Cugini: GSoC 2010 project (quantum computing)
92. Nicholas J.S. Kinar: improved documentation about “Immutability of Expressions”
93. Thomas Dixon: fix a limit bug
94. Cristóvão Sousa: implements _sage_ method for sign function.
95. Andre de Fortier Smit: doctests in matrices improved
96. Alexey U. Goodchenko: various work in matrices
97. Gary Kerr: fix examples, docs
98. Sherjil Ozair: fixes to SparseMatrix
99. Oleksandr Gituliar: fixes to Matrix
100. Sean Vig: Quantum improvement
101. Prafullkumar P. Tale: fixed plotting documentation
102. Vladimir Perić: fix some Python 3 issues
103. Tom Bachmann: fixes to Real
104. Yuri Karadzhov: improvements to hyperbolic identities
105. Vladimir Lagunov: improvements to the geometry module
106. Matthew Rocklin: improvements to Number instantiation
107. Saptarshi Mandal: Test for an integral
108. Gilbert Gede: Tests for solvers
109. Anatolii Koval: Infinite 1D box example
110. Tomo Lazovich: fixes to quantum operators
111. Pavel Fedotov: fix to is_number
112. Kibeom Kim: fixes to cse function and preorder_traversal
113. Gregory Ksionda: fixes to Integral instantiation
114. Tomáš Bambas: prettier printing of examples
115. Jeremias Yehdegho: fixes to the nthoery module
116. Jack McCaffery: fixes to asin and acos
117. Luca Weihs: improvements to the geometry module
118. Shai ‘Deshe’ Wyborski: fix to numeric evaluation of hypergeometric sums
119. Óscar Nájera: better Laguerre polynomial generator
120. Mario Pernici: faster algorithm for computing Groebner bases

Up-to-date list in the order of the first contribution is given in the AUTHORS file.

You can find a brief history of SymPy in the README.

Financial and Infrastructure Support

• Google: SymPy has received generous financial support from Google in 2007 by financing 5 students through the Google Summer of Code (GSOC 2007) program (more info) and 1 student in 2008 (more info)
• Python Software Foundation: PSF hosted 3 GSoC 2007 students (Brian, Robert and Jason), and 1 GSoC 2008 student (Fredrik)
• the Space Telescope Science Institute: STScI hosted 1 GSoC 2007 student (Mateusz)
• Portland State University: PSU hosted 1 GSoC 2007 student (Chris)
• Simula Research Laboratory: supports Pearu Peterson work in SymPy/Sympy Core projects

License

Unless stated otherwise, all files in the SymPy project, SymPy’s webpage (and wiki), all images and all documentation including this User’s Guide is licensed using the new BSD license:

Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011 SymPy Development Team

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

  a. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
  b. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
  c. Neither the name of the SymPy nor the names of its contributors
     may be used to endorse or promote products derived from this software
     without specific prior written permission.


THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
DAMAGE.