Labelings and products of graphs
Does anybody have any question about what has been explained so far?
OMER: I think I understand what a product is, but I don’t quite understand what the X is that appears in the diagram
Well, in the definition of product of B1 and B2 in , there are infinitely many conditions the projections have to satisfy: one for each object X and each pair of maps f1 and f2. To say that Marco is the tallest person in the family means that for each person X in the family, X is at most as tall as Marco. The universal ...