Theorem int3 45362

Description: The virtual deduction introduction rule of converting the end virtual hypothesis of 3 virtual hypotheses into an antecedent. Conventional form of int3 45362 is 3expia 1139. (Contributed by Alan Sare, 13-Jun-2015.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
int3.1	⊢ (   (   𝜑   ,   𝜓   ,   𝜒   )   ▶   𝜃   )

Assertion

Ref	Expression
int3	⊢ (   (   𝜑   ,   𝜓   )   ▶   (𝜒 → 𝜃)   )

Proof of Theorem int3

Step	Hyp	Ref	Expression
1		int3.1	. . . 4 ⊢ (   (   𝜑   ,   𝜓   ,   𝜒   )   ▶   𝜃   )
2	1	dfvd3ani 45345	. . 3 ⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒) → 𝜃)
3	2	3expia 1139	. 2 ⊢ ((𝜑 ∧ 𝜓) → (𝜒 → 𝜃))
4	3	dfvd2anir 45334	1 ⊢ (   (   𝜑   ,   𝜓   )   ▶   (𝜒 → 𝜃)   )

This proof depends on syntax axioms:   → wi 4  (   wvd1 45319  (   wvhc2 45330  (   wvhc3 45338

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-vd1 45320  df-vhc2 45331  df-vhc3 45339

This theorem is used by:  suctrALTcfVD  45672