Theorem e102 42178

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

Hypotheses

Ref	Expression
e102.1	⊢ (   𝜑   ▶   𝜓   )
e102.2	⊢ 𝜒
e102.3	⊢ (   𝜑   ,   𝜃   ▶   𝜏   )
e102.4	⊢ (𝜓 → (𝜒 → (𝜏 → 𝜂)))

Assertion

Ref	Expression
e102	⊢ (   𝜑   ,   𝜃   ▶   𝜂   )

Proof of Theorem e102

Step	Hyp	Ref	Expression
1		e102.1	. 2 ⊢ (   𝜑   ▶   𝜓   )
2		e102.2	. . 3 ⊢ 𝜒
3	2	vd01 42106	. 2 ⊢ (   𝜑   ▶   𝜒   )
4		e102.3	. 2 ⊢ (   𝜑   ,   𝜃   ▶   𝜏   )
5		e102.4	. 2 ⊢ (𝜓 → (𝜒 → (𝜏 → 𝜂)))
6	1, 3, 4, 5	e112 42163	1 ⊢ (   𝜑   ,   𝜃   ▶   𝜂   )

Syntax hints:   → wi 4  (   wvd1 42078  (   wvd2 42086

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-an 396  df-vd1 42079  df-vd2 42087

This theorem is referenced by: (None)