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Theorem pm3.4 544
Description: Conjunction implies implication. Theorem *3.4 of [WhiteheadRussell] p. 113. (Contributed by NM, 31-Jul-1995.)
Assertion
Ref Expression
pm3.4 ((φ ψ) → (φψ))

Proof of Theorem pm3.4
StepHypRef Expression
1 simpr 447 . 2 ((φ ψ) → ψ)
21a1d 22 1 ((φ ψ) → (φψ))
Colors of variables: wff setvar class
Syntax hints:  wi 4   wa 358
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
This theorem is referenced by:  sbequ1  1918
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