Did you know nearly 5 million pounds of wrapping paper is used every year in the United States (with the majority used during the holiday season)? While the greenest option ...
Example Let A be the category (0 → 1) consisting of a single nontrivial map. Then an object of SetobA is a pair (P0, P1) of sets, and an object of SetA is a function X0 f → X1 between a pair of ...