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Theorem dalem-ccly 35474
 Description: Lemma for dath 35525. Frequently-used utility lemma. (Contributed by NM, 15-Aug-2012.)
Hypothesis
Ref Expression
da.ps0 (𝜓 ↔ ((𝑐𝐴𝑑𝐴) ∧ ¬ 𝑐 𝑌 ∧ (𝑑𝑐 ∧ ¬ 𝑑 𝑌𝐶 (𝑐 𝑑))))
Assertion
Ref Expression
dalem-ccly (𝜓 → ¬ 𝑐 𝑌)

Proof of Theorem dalem-ccly
StepHypRef Expression
1 da.ps0 . 2 (𝜓 ↔ ((𝑐𝐴𝑑𝐴) ∧ ¬ 𝑐 𝑌 ∧ (𝑑𝑐 ∧ ¬ 𝑑 𝑌𝐶 (𝑐 𝑑))))
21simp2bi 1141 1 (𝜓 → ¬ 𝑐 𝑌)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 383   ∧ w3a 1072   ∈ wcel 2139   ≠ wne 2932   class class class wbr 4804  (class class class)co 6813 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-an 385  df-3an 1074 This theorem is referenced by:  dalemswapyzps  35479  dalemrotps  35480  dalem21  35483  dalem23  35485  dalem24  35486  dalem39  35500  dalem48  35509
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