Theorem 19.16 2225

Description: Theorem 19.16 of [Margaris] p. 90. (Contributed by NM, 12-Mar-1993.)

Hypothesis

Ref	Expression
19.16.1	⊢ Ⅎ𝑥𝜑

Assertion

Ref	Expression
19.16	⊢ (∀𝑥(𝜑 ↔ 𝜓) → (𝜑 ↔ ∀𝑥𝜓))

Proof of Theorem 19.16

Step	Hyp	Ref	Expression
1		19.16.1	. . 3 ⊢ Ⅎ𝑥𝜑
2	1	19.3 2202	. 2 ⊢ (∀𝑥𝜑 ↔ 𝜑)
3		albi 1818	. 2 ⊢ (∀𝑥(𝜑 ↔ 𝜓) → (∀𝑥𝜑 ↔ ∀𝑥𝜓))
4	2, 3	bitr3id 285	1 ⊢ (∀𝑥(𝜑 ↔ 𝜓) → (𝜑 ↔ ∀𝑥𝜓))

Syntax hints:   → wi 4   ↔ wb 206  ∀wal 1538  Ⅎwnf 1783

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-12 2177

This theorem depends on definitions:  df-bi 207  df-ex 1780  df-nf 1784

This theorem is referenced by: (None)