Theorem e110 42185

Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 24-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
e110.1	⊢ (   𝜑   ▶   𝜓   )
e110.2	⊢ (   𝜑   ▶   𝜒   )
e110.3	⊢ 𝜃
e110.4	⊢ (𝜓 → (𝜒 → (𝜃 → 𝜏)))

Assertion

Ref	Expression
e110	⊢ (   𝜑   ▶   𝜏   )

Proof of Theorem e110

Step	Hyp	Ref	Expression
1		e110.1	. 2 ⊢ (   𝜑   ▶   𝜓   )
2		e110.2	. 2 ⊢ (   𝜑   ▶   𝜒   )
3		e110.3	. . 3 ⊢ 𝜃
4	3	vd01 42106	. 2 ⊢ (   𝜑   ▶   𝜃   )
5		e110.4	. 2 ⊢ (𝜓 → (𝜒 → (𝜃 → 𝜏)))
6	1, 2, 4, 5	e111 42183	1 ⊢ (   𝜑   ▶   𝜏   )

Syntax hints:   → wi 4  (   wvd1 42078

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 206  df-vd1 42079

This theorem is referenced by:  2uasbanhVD  42420