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, plus links to their wiki pages (if they have one on the page People), 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: project leader
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
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), other fixes
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
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() and latex fixes
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
81. Julio Idichekop Filho: indentation fixes, docstring improvements
82. Łukasz Pankowski: fix matrix multiplication with numpy scalars

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 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.


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