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Theorem e31an 39914
Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 24-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
e31an.1 (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜃   )
e31an.2 (   𝜑   ▶   𝜏   )
e31an.3 ((𝜃𝜏) → 𝜂)
Assertion
Ref Expression
e31an (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜂   )

Proof of Theorem e31an
StepHypRef Expression
1 e31an.1 . 2 (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜃   )
2 e31an.2 . 2 (   𝜑   ▶   𝜏   )
3 e31an.3 . . 3 ((𝜃𝜏) → 𝜂)
43ex 403 . 2 (𝜃 → (𝜏𝜂))
51, 2, 4e31 39912 1 (   𝜑   ,   𝜓   ,   𝜒   ▶   𝜂   )
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 386  (   wvd1 39721  (   wvd3 39739
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 199  df-an 387  df-3an 1073  df-vd1 39722  df-vd3 39742
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator