1. J

    Proof using Element Chasing the associative law of symetric difference

    Hi there, I have to prove using Element Chasing that (A delta B) delta C = A delta ( B delta C) I have the Venn drawn, and was told to start with: let x be an element of (A delta B) delta C if x is an element of (A delta B) union(and) C but not in x element (A delta B)...
  2. H

    Cat chasing mouse problem

    Hi, Can anyone help me with this: We have a room H deep and W wide. In the far right corner is a mousehole. The cat starts in the bottom left corner, and the mouse starts in the top left corner i.e. cat starts at (0,0) and mouse at (0,H), and the mouse hole is at (W,H). The cat starts to...