Theorem e01 44928

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 44834	. 2 ⊢ (   𝜓   ▶   𝜑   )
3		e01.2	. 2 ⊢ (   𝜓   ▶   𝜒   )
4		e01.3	. 2 ⊢ (𝜑 → (𝜒 → 𝜃))
5	2, 3, 4	e11 44925	1 ⊢ (   𝜓   ▶   𝜃   )

Syntax hints:   → wi 4  (   wvd1 44806

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 44807

This theorem is referenced by:  e01an  44929  trsspwALT  45054  sspwtr  45057  pwtrVD  45060  pwtrrVD  45061  snssiALTVD  45063  snelpwrVD  45067  sstrALT2VD  45070  suctrALT2VD  45072  3impexpVD  45092  ax6e2eqVD  45143  ax6e2ndVD  45144  2sb5ndVD  45146  vk15.4jVD  45150