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Use the definitions: x S T iff (x S) (x T) x S' iff (x S) S T iff (x)(x S X T) 1. Prove
Use the definitions:
x S T iff (x S) (x T)
x S' iff (x S)
S T iff (x)(x S X T)
1. Prove line-by-line:
r (p q)
assuming that r q and (q r) p
2. A, B, C & A B are sets.
Prove:
BnCgAnC
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