Theorem e01 45142

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 45048	. 2 ⊢ (   𝜓   ▶   𝜑   )
3		e01.2	. 2 ⊢ (   𝜓   ▶   𝜒   )
4		e01.3	. 2 ⊢ (𝜑 → (𝜒 → 𝜃))
5	2, 3, 4	e11 45139	1 ⊢ (   𝜓   ▶   𝜃   )

Syntax hints:   → wi 4  (   wvd1 45020

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 208  df-vd1 45021

This theorem is referenced by:  e01an  45143  trsspwALT  45268  sspwtr  45271  pwtrVD  45274  pwtrrVD  45275  snssiALTVD  45277  snelpwrVD  45281  sstrALT2VD  45284  suctrALT2VD  45286  3impexpVD  45306  ax6e2eqVD  45357  ax6e2ndVD  45358  2sb5ndVD  45360  vk15.4jVD  45364