Theorem bj-chvarvv 33261

Description: Version of chvarv 2418 with a disjoint variable condition, which does not require ax-13 2391. (Contributed by BJ, 31-May-2019.) (Proof modification is discouraged.)

Hypotheses

Ref	Expression
bj-chvarvv.1	⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓))
bj-chvarvv.2	⊢ 𝜑

Assertion

Ref	Expression
bj-chvarvv	⊢ 𝜓

Distinct variable groups:   𝑥,𝑦   𝜓,𝑥

Allowed substitution hints:   𝜑(𝑥,𝑦)   𝜓(𝑦)

Proof of Theorem bj-chvarvv

Step	Hyp	Ref	Expression
1		bj-chvarvv.1	. . 3 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓))
2	1	bj-spvv 33258	. 2 ⊢ (∀𝑥𝜑 → 𝜓)
3		bj-chvarvv.2	. 2 ⊢ 𝜑
4	2, 3	mpg 1898	1 ⊢ 𝜓

Syntax hints:   → wi 4   ↔ wb 198

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1896  ax-4 1910  ax-5 2011  ax-6 2077

This theorem depends on definitions:  df-bi 199  df-ex 1881

This theorem is referenced by:  bj-axext3  33295  bj-axrep1  33314  bj-axsep2  33445