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10
votes
2answers
145 views

How to get used to commutative diagrams? (the case of products).

I've returned to Aluffi's book (after getting the basics of groups from Herstein's) and I hit the same brick wall that made me put it aside. My general problem is this: I can't seem to get used to ...
-1
votes
0answers
29 views

Defining miscellaneous products in a miscellaneous mathematical structure

This is a question about elementary sets, functions and relations, and about a functor $F$ that maps functions $f\subseteq X\times Y$ to relations $F(f)\subseteq F(X)\times F(Y)$. The miscellaneous ...