books.google.com - This text and reference book on Category Theory, a branch of abstract algebra, is aimed not only at students of Mathematics, but also researchers and students of Computer Science, Logic, Linguistics, Cognitive Science, Philosophy, and any of the other fields that now make use of it. Containing clear...https://books.google.com/books/about/Category_Theory.html?id=IK_sIDI2TCwC&q=limits&utm_source=gb-gplus-shareCategory Theory