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Theorem simp31l 1078
Description: Simplification of conjunction. (Contributed by NM, 9-Mar-2012.)
Assertion
Ref Expression
simp31l ((τ η ((φ ψ) χ θ)) → φ)

Proof of Theorem simp31l
StepHypRef Expression
1 simp1l 979 . 2 (((φ ψ) χ θ) → φ)
213ad2ant3 978 1 ((τ η ((φ ψ) χ θ)) → φ)
Colors of variables: wff setvar class
Syntax hints:  wi 4   wa 358   w3a 934
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 177  df-an 360  df-3an 936
This theorem is referenced by: (None)
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