锻炼脑筋的东西 :)
斯坦福的教程
http://plato.stanford.edu/entries/category-theory/
Basic category theory
http://www.staff.science.uu.nl/~ooste110/syllabi/catsmoeder.pdf
Basic category theory for computer scientists
http://books.google.com.hk/books?id=ezdeaHfpYPwC&printsec=frontcover&dq=category+theory&source=bl&ots=_j7X8yEpp6&sig=Yg1c1PcvfxzP6NfK_eBfxuhyd6w&hl=zh-CN&ei=coVWTJ6xDYWiuQPg55nYBg&sa=X&oi=book_result&ct=result&resnum=8&ved=0CEUQ6AEwBw#v=onepage&q&f=false
category theory in nlabs
http://ncatlab.org/nlab/show/category+theory
斯坦福的教程
http://plato.stanford.edu/entries/category-theory/
Basic category theory
http://www.staff.science.uu.nl/~ooste110/syllabi/catsmoeder.pdf
Basic category theory for computer scientists
http://books.google.com.hk/books?id=ezdeaHfpYPwC&printsec=frontcover&dq=category+theory&source=bl&ots=_j7X8yEpp6&sig=Yg1c1PcvfxzP6NfK_eBfxuhyd6w&hl=zh-CN&ei=coVWTJ6xDYWiuQPg55nYBg&sa=X&oi=book_result&ct=result&resnum=8&ved=0CEUQ6AEwBw#v=onepage&q&f=false
category theory in nlabs
http://ncatlab.org/nlab/show/category+theory