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Theorem anabs7 662
Description: Absorption into embedded conjunct. (Contributed by NM, 20-Jul-1996.) (Proof shortened by Wolf Lammen, 17-Nov-2013.)
Assertion
Ref Expression
anabs7 ((𝜓 ∧ (𝜑𝜓)) ↔ (𝜑𝜓))

Proof of Theorem anabs7
StepHypRef Expression
1 simpr 487 . . 3 ((𝜑𝜓) → 𝜓)
21pm4.71ri 563 . 2 ((𝜑𝜓) ↔ (𝜓 ∧ (𝜑𝜓)))
32bicomi 226 1 ((𝜓 ∧ (𝜑𝜓)) ↔ (𝜑𝜓))
Colors of variables: wff setvar class
Syntax hints:  wb 208  wa 398
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 209  df-an 399
This theorem is referenced by:  prtlem15  36005  un2122  41117
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