Theorem vd01 44636

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

Hypothesis

Ref	Expression
vd01.1	⊢ 𝜑

Assertion

Ref	Expression
vd01	⊢ (   𝜓   ▶   𝜑   )

Proof of Theorem vd01

Step	Hyp	Ref	Expression
1		vd01.1	. . 3 ⊢ 𝜑
2	1	a1i 11	. 2 ⊢ (𝜓 → 𝜑)
3	2	dfvd1ir 44612	1 ⊢ (   𝜓   ▶   𝜑   )

Syntax hints:  (   wvd1 44608

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-vd1 44609

This theorem is referenced by:  e210  44698  e201  44700  e021  44704  e012  44706  e102  44708  e110  44715  e101  44717  e011  44719  e100  44721  e010  44723  e001  44725  e01  44730  e10  44733  sspwimpVD  44957