Theorem e01 44711

Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 25-Jul-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
e01.1	⊢ 𝜑
e01.2	⊢ (   𝜓   ▶   𝜒   )
e01.3	⊢ (𝜑 → (𝜒 → 𝜃))

Assertion

Ref	Expression
e01	⊢ (   𝜓   ▶   𝜃   )

Proof of Theorem e01

Step	Hyp	Ref	Expression
1		e01.1	. . 3 ⊢ 𝜑
2	1	vd01 44617	. 2 ⊢ (   𝜓   ▶   𝜑   )
3		e01.2	. 2 ⊢ (   𝜓   ▶   𝜒   )
4		e01.3	. 2 ⊢ (𝜑 → (𝜒 → 𝜃))
5	2, 3, 4	e11 44708	1 ⊢ (   𝜓   ▶   𝜃   )

Syntax hints:   → wi 4  (   wvd1 44589

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 44590

This theorem is referenced by:  e01an  44712  trsspwALT  44838  sspwtr  44841  pwtrVD  44844  pwtrrVD  44845  snssiALTVD  44847  snelpwrVD  44851  sstrALT2VD  44854  suctrALT2VD  44856  3impexpVD  44876  ax6e2eqVD  44927  ax6e2ndVD  44928  2sb5ndVD  44930  vk15.4jVD  44934