Theorem exancom

Description: Commutation of conjunction inside an existential quantifier. (Contributed by NM, 18-Aug-1993)

	Ref	Expression
Assertion	exancom	⊢ ( ∃ 𝑥 ( 𝜑 ∧ 𝜓 ) ↔ ∃ 𝑥 ( 𝜓 ∧ 𝜑 ) )

Proof

Step	Hyp	Ref	Expression
1		ancom	⊢ ( ( 𝜑 ∧ 𝜓 ) ↔ ( 𝜓 ∧ 𝜑 ) )
2	1	exbii	⊢ ( ∃ 𝑥 ( 𝜑 ∧ 𝜓 ) ↔ ∃ 𝑥 ( 𝜓 ∧ 𝜑 ) )