sympy/sympy — pull request #916 by arpit8991 (2011-12-31 23:01:39+00:00)
Title: [GCI] added See Also feature in functions (combinatorial & elementary)

http://www.google-melange.com/gci/task/view/google/gci2011/7133281
http://code.google.com/p/sympy/issues/detail?id=2777