Thanks, that's one of my interests. Just the other day, I was looking at the table here: http://en.wikipedia.org/wiki/Logic_gate#Logic_gates http://en.wikipedia

Thanks, that's one of my interests. Just the other day, I was looking at the table here: http://en.wikipedia.org/wiki/Logic_gate#Logic_gates http://en.wikipedia.org/wiki/Logic_gate#Logic_gates (implication is #14 of 16 possible boolean functions). Sometimes, going back to relay logic helps. For instance, Clause Shannon's BSTJ Jan.1948 paper, "The Synthesis of Two-Terminal Switching Circuits". Or his 1940 master's thesis, A Symbolic Analysis of Relay and Switching Circuits (http://dspace.mit.edu/handle/1721.1/11173 http://dspace.mit.edu/handle/1721.1/11173)