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Update the comment in __init__.py to include the principal reference.

This book should be referenced by the notation [JoyOfCats].
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commit 7866fc8c76bc33cf457b30317b764e59594899f1 1 parent 65da9ae
Sergiu Ivanov authored
Showing with 13 additions and 1 deletion.
  1. +13 −1 sympy/categories/__init__.py
14 sympy/categories/__init__.py
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@@ -1,8 +1,20 @@
-"""Category Theory module.
+"""
+Category Theory module.
Provides some of the fundamental category-theory-related classes,
including categories, morphisms, diagrams. Functors are not
implemented yet.
+
+The general reference work this module tries to follow is
+
+ [JoyOfCats] J. Adamek, H. Herrlich. G. E. Strecker: Abstract and
+ Concrete Categories. The Joy of Cats.
+
+The latest version of this book should be available for free download
+from
+
+ katmat.math.uni-bremen.de/acc/acc.pdf
+
"""
from baseclasses import Object, Morphism
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