Theorem alcoms 2194

Description: Swap quantifiers in an antecedent. (Contributed by NM, 11-May-1993.)

Hypothesis

Ref	Expression
alcoms.1	⊢ (∀𝑥∀𝑦𝜑 → 𝜓)

Assertion

Ref	Expression
alcoms	⊢ (∀𝑦∀𝑥𝜑 → 𝜓)

Proof of Theorem alcoms

Step	Hyp	Ref	Expression
1		ax-11 2193	. 2 ⊢ (∀𝑦∀𝑥𝜑 → ∀𝑥∀𝑦𝜑)
2		alcoms.1	. 2 ⊢ (∀𝑥∀𝑦𝜑 → 𝜓)
3	1, 2	syl 18	1 ⊢ (∀𝑦∀𝑥𝜑 → 𝜓)

This proof depends on syntax axioms:   → wi 4  ∀wal 1567

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-11 2193

This theorem is used by:  cbv2h  2435  mo3  2589  bj-nfalt  37709  bj-cbv3ta  37792  bj-cbv2hv  37803  wl-equsal1i  38583  wl-mo3t  38615  axc11n-16  40102  axc11next  45497