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 ) )

Proof

Step	Hyp	Ref	Expression
1		ax7v	⊢ ( 𝑥 = 𝑦 → ( 𝑥 = 𝑧 → 𝑦 = 𝑧 ) )