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Metamath Proof Explorer

Theorem aev

Description: A "distinctor elimination" lemma with no disjoint variable conditions on variables in the consequent. (Contributed by NM, 8-Nov-2006) Remove dependency on ax-11 . (Revised by Wolf Lammen, 7-Sep-2018) Remove dependency on ax-13 , inspired by an idea of BJ. (Revised by Wolf Lammen, 30-Nov-2019) Remove dependency on ax-12 . (Revised by Wolf Lammen, 19-Mar-2021)

		Ref	Expression
	Assertion	aev	$⊢ \forall x x = y \to \forall z t = u$

Proof

Step	Hyp	Ref	Expression
1		aevlem	$⊢ \forall x x = y \to \forall v v = w$
2		aeveq	$⊢ \forall v v = w \to t = u$
3	2	alrimiv	$⊢ \forall v v = w \to \forall z t = u$
4	1 3	syl	$⊢ \forall x x = y \to \forall z t = u$