Theorem vd02 44571

Description: Two virtual hypotheses virtually infer a theorem. (Contributed by Alan Sare, 14-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
vd02.1	⊢ 𝜑

Assertion

Ref	Expression
vd02	⊢ (   𝜓   ,   𝜒   ▶   𝜑   )

Proof of Theorem vd02

Step	Hyp	Ref	Expression
1		vd02.1	. . . 4 ⊢ 𝜑
2	1	a1i 11	. . 3 ⊢ (𝜒 → 𝜑)
3	2	a1i 11	. 2 ⊢ (𝜓 → (𝜒 → 𝜑))
4	3	dfvd2ir 44559	1 ⊢ (   𝜓   ,   𝜒   ▶   𝜑   )

Syntax hints:   → wi 4  (   wvd2 44550

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 207  df-an 396  df-vd2 44551

This theorem is referenced by:  e220  44610  e202  44612  e022  44614  e002  44616  e020  44618  e200  44620  e02  44670  e20  44700