Question: 1 Implication Prove that A B C D in Prop, ( A = B ) = ( A = C ) = ( B =

1 Implication
Prove that
A B C D in Prop,(A = B)=(A = C)=(B = C = D)= A = D.
for which the Coq statement is
Lemma prob1 : forall A B C D : Prop, (A -> B)->(A -> C)->(B -> C -> D)-> A -> D.

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