Theorem bj-pm11.53v 37136

Description: Version of pm11.53v 1951 with nonfreeness antecedents. (Contributed by BJ, 7-Oct-2024.)

Assertion

Ref	Expression
bj-pm11.53v	⊢ ((∀𝑥Ⅎ'𝑦𝜑 ∧ ∀𝑦Ⅎ'𝑥𝜓) → (∀𝑥∀𝑦(𝜑 → 𝜓) ↔ (∃𝑥𝜑 → ∀𝑦𝜓)))

Proof of Theorem bj-pm11.53v

Step	Hyp	Ref	Expression
1		bj-nnfalt 37134	. 2 ⊢ (∀𝑦Ⅎ'𝑥𝜓 → Ⅎ'𝑥∀𝑦𝜓)
2		bj-pm11.53vw 37111	. 2 ⊢ ((∀𝑥Ⅎ'𝑦𝜑 ∧ Ⅎ'𝑥∀𝑦𝜓) → (∀𝑥∀𝑦(𝜑 → 𝜓) ↔ (∃𝑥𝜑 → ∀𝑦𝜓)))
3	1, 2	sylan2 599	1 ⊢ ((∀𝑥Ⅎ'𝑦𝜑 ∧ ∀𝑦Ⅎ'𝑥𝜓) → (∀𝑥∀𝑦(𝜑 → 𝜓) ↔ (∃𝑥𝜑 → ∀𝑦𝜓)))

Syntax hints:   → wi 4   ↔ wb 207   ∧ wa 396  ∀wal 1545  ∃wex 1786  Ⅎ'wnnf 37070

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-10 2152  ax-11 2168  ax-12 2189

This theorem depends on definitions:  df-bi 208  df-an 397  df-ex 1787  df-bj-nnf 37071

This theorem is referenced by: (None)