Theorem rgen2w 2564

Description: Generalization rule for restricted quantification. Note that 𝑥 and 𝑦 needn't be distinct. (Contributed by NM, 18-Jun-2014.)

Hypothesis

Ref	Expression
rgenw.1	⊢ 𝜑

Assertion

Ref	Expression
rgen2w	⊢ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝜑

Proof of Theorem rgen2w

Step	Hyp	Ref	Expression
1		rgenw.1	. . 3 ⊢ 𝜑
2	1	rgenw 2563	. 2 ⊢ ∀𝑦 ∈ 𝐵 𝜑
3	2	rgenw 2563	1 ⊢ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐵 𝜑

Syntax hints:  ∀wral 2486

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-gen 1473

This theorem depends on definitions:  df-bi 117  df-ral 2491

This theorem is referenced by:  fnmpoi  6312  ixxf  10055  fzf  10169  rexfiuz  11415  prdsvallem  13219  eltx  14846  txcnp  14858  txcnmpt  14860  txrest  14863  txlm  14866