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Theorem e001 39330
Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 24-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
e001.1 𝜑
e001.2 𝜓
e001.3 (   𝜒   ▶   𝜃   )
e001.4 (𝜑 → (𝜓 → (𝜃𝜏)))
Assertion
Ref Expression
e001 (   𝜒   ▶   𝜏   )

Proof of Theorem e001
StepHypRef Expression
1 e001.1 . . 3 𝜑
21vd01 39241 . 2 (   𝜒   ▶   𝜑   )
3 e001.2 . . 3 𝜓
43vd01 39241 . 2 (   𝜒   ▶   𝜓   )
5 e001.3 . 2 (   𝜒   ▶   𝜃   )
6 e001.4 . 2 (𝜑 → (𝜓 → (𝜃𝜏)))
72, 4, 5, 6e111 39318 1 (   𝜒   ▶   𝜏   )
Colors of variables: wff setvar class
Syntax hints:  wi 4  (   wvd1 39204
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 197  df-vd1 39205
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator