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Theorem unitresl 34189
Description: A lemma for Conjunctive Normal Form unit propagation, in deduction form. (Contributed by Giovanni Mascellani, 15-Sep-2017.)
Hypotheses
Ref Expression
unitresl.1 (𝜑 → (𝜓𝜒))
unitresl.2 (𝜑 → ¬ 𝜒)
Assertion
Ref Expression
unitresl (𝜑𝜓)

Proof of Theorem unitresl
StepHypRef Expression
1 unitresl.1 . 2 (𝜑 → (𝜓𝜒))
2 unitresl.2 . 2 (𝜑 → ¬ 𝜒)
3 orcom 888 . . 3 ((𝜓𝜒) ↔ (𝜒𝜓))
4 df-or 866 . . 3 ((𝜒𝜓) ↔ (¬ 𝜒𝜓))
53, 4sylbb 210 . 2 ((𝜓𝜒) → (¬ 𝜒𝜓))
61, 2, 5sylc 65 1 (𝜑𝜓)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wo 865
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 198  df-or 866
This theorem is referenced by:  unitresr  34190
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