text: But... it isn't. I assume, from your reference to truth tables, that you're referring to boolean algebra, so you're asking me to show that A and B = A xor B. It isn't. In fact , A * B implies ¬A+B, and vice versa.\n\nEdit: Um... dualspace, what about A=5/4 and B=5? Or A=2 and B=2? Or in general:\nab=a+b\n(b-1)a=b\na=b/(b-1)\nAlthough, as mentioned above, that's not what he's talking about.