Answer to Question #2474 in Discrete Mathematics for Rob
Note* - ~ denotes the complement of an element
ex- ~0 = 1 and ~1 = 0
x ~x = 0, x x = x,& 1+x = 1
f(x,y,z) = x(~y+~yz+~x)+(~xy+y~z)(x~yz+~xz) =
=& x~y+x~yz+x~x + ~xyx~yz + ~xy~xz + y~zx~yz +~ y~zxz =
= x~y+x~yz+ 0 + 0 + ~xyz + 0 + 0 =
= x~y + x~yz + ~xyz =
= x~y(1+z) + ~xyz =
= x~y + ~xyz.
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