Theorem ax6er

Description: Commuted form of ax6e . (Could be placed right after ax6e ). (Contributed by BJ, 15-Sep-2018)

	Ref	Expression
Assertion	ax6er	⊢ ∃ 𝑥 𝑦 = 𝑥

Proof

Step	Hyp	Ref	Expression
1		ax6e	⊢ ∃ 𝑥 𝑥 = 𝑦
2		equcomi	⊢ ( 𝑥 = 𝑦 → 𝑦 = 𝑥 )
3	1 2	eximii	⊢ ∃ 𝑥 𝑦 = 𝑥