Theorem gen21 39369

Description: Virtual deduction generalizing rule for one quantifying variables and two virtual hypothesis. gen21 39369 is alrimdv 2009 with virtual deductions. (Contributed by Alan Sare, 25-Jul-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
gen21.1	⊢ (   𝜑   ,   𝜓   ▶   𝜒   )

Assertion

Ref	Expression
gen21	⊢ (   𝜑   ,   𝜓   ▶   ∀𝑥𝜒   )

Distinct variable groups:   𝜑,𝑥   𝜓,𝑥

Allowed substitution hint:   𝜒(𝑥)

Proof of Theorem gen21

Step	Hyp	Ref	Expression
1		gen21.1	. . . 4 ⊢ (   𝜑   ,   𝜓   ▶   𝜒   )
2	1	dfvd2i 39326	. . 3 ⊢ (𝜑 → (𝜓 → 𝜒))
3	2	alrimdv 2009	. 2 ⊢ (𝜑 → (𝜓 → ∀𝑥𝜒))
4	3	dfvd2ir 39327	1 ⊢ (   𝜑   ,   𝜓   ▶   ∀𝑥𝜒   )

Syntax hints:  ∀wal 1629  (   wvd2 39318

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991

This theorem depends on definitions:  df-bi 197  df-an 383  df-vd2 39319

This theorem is referenced by:  truniALTVD  39636  trintALTVD  39638  onfrALTlem2VD  39647