Hello Group,


Let D represent capital Delta and denote the symmetric difference of
two sets A and B. Prove that,

(A D B) is logically equivelant to (A union B) - (A intersect B)

I understand to prove that two sets are logically equivelant means to
show that P is a subset of Q and also Q is a subset of P. But, I was
not sure how to prove that the above was logically equivelant. I can
see that it is true using pictures, but I want to improve my
understanding of how to do such proofs abstractly rather than relying on
pictures.


Corey...
isomorphics@...