Metamath Proof Explorer

Theorem ax7v2

Description: Second of two weakened versions of ax7v , with an extra disjoint variable condition on y , z , see comments there. (Contributed by BJ, 7-Dec-2020)

Ref Expression
Assertion ax7v2 x = y x = z y = z


Step Hyp Ref Expression
1 ax7v x = y x = z y = z