Theorem int2 41707

Description: The virtual deduction introduction rule of converting the end virtual hypothesis of 2 virtual hypotheses into an antecedent. Conventional form of int2 41707 is ex 416. (Contributed by Alan Sare, 23-Apr-2015.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
int2.1	⊢ (   (   𝜑   ,   𝜓   )   ▶   𝜒   )

Assertion

Ref	Expression
int2	⊢ (   𝜑   ▶   (𝜓 → 𝜒)   )

Proof of Theorem int2

Step	Hyp	Ref	Expression
1		int2.1	. . . 4 ⊢ (   (   𝜑   ,   𝜓   )   ▶   𝜒   )
2	1	dfvd2ani 41684	. . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝜒)
3	2	ex 416	. 2 ⊢ (𝜑 → (𝜓 → 𝜒))
4	3	dfvd1ir 41674	1 ⊢ (   𝜑   ▶   (𝜓 → 𝜒)   )

Syntax hints:   → wi 4  (   wvd1 41670  (   wvhc2 41681

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 210  df-an 400  df-vd1 41671  df-vhc2 41682

This theorem is referenced by:  sspwimpVD  42020  sspwimpcfVD  42022  suctrALTcfVD  42024