Theorem e30 45485

Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 12-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
e30.1	⊢ (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜃   )
e30.2	⊢ 𝜏
e30.3	⊢ (𝜃 → (𝜏 → 𝜂))

Assertion

Ref	Expression
e30	⊢ (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜂   )

Proof of Theorem e30

Step	Hyp	Ref	Expression
1		e30.1	. 2 ⊢ (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜃   )
2		e30.2	. . 3 ⊢ 𝜏
3	2	vd03 45341	. 2 ⊢ (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜏   )
4		e30.3	. 2 ⊢ (𝜃 → (𝜏 → 𝜂))
5	1, 3, 4	e33 45475	1 ⊢ (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜂   )

This proof depends on syntax axioms:   → wi 4  (   wvd3 45329

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105  df-vd3 45332

This theorem is used by:  e30an  45487