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3) The law of non-contradiction: A thing cannot at the same time and in the same context both be and not be thus-and-such. A is not equal to non-A
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For instance, energy cannot be matter. A photon can not be both a wave and a particle. Oh wait - they can. Dear me! I guess that Aristotle guy may not have been an expert on 20'th century physics after all.
<font size=-1>[ This Message was edited by: Espritch on 2002-07-06 23:15 ]</font>