Theorem bj-axc16g16

Description: Proof of axc16g from { ax-1 -- ax-7 , axc16 }. (Contributed by BJ, 6-Jul-2021) (Proof modification is discouraged.)

	Ref	Expression
Assertion	bj-axc16g16	$$⊢\forall xx=y\to \left(\phi \to \forall z\phi \right)$$

Proof

Step	Hyp	Ref	Expression
1		aevlem	$$⊢\forall xx=y\to \forall zz=t$$
2		axc16	$$⊢\forall zz=t\to \left(\phi \to \forall z\phi \right)$$
3	1 2	syl	$$⊢\forall xx=y\to \left(\phi \to \forall z\phi \right)$$