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Theorem equidqe 36673
Description: equid 2020 with existential quantifier without using ax-c5 36634 or ax-5 1918. (Contributed by NM, 13-Jan-2011.) (Proof shortened by Wolf Lammen, 27-Feb-2014.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
equidqe ¬ ∀𝑦 ¬ 𝑥 = 𝑥

Proof of Theorem equidqe
StepHypRef Expression
1 ax6fromc10 36647 . 2 ¬ ∀𝑦 ¬ 𝑦 = 𝑥
2 ax7 2024 . . . . 5 (𝑦 = 𝑥 → (𝑦 = 𝑥𝑥 = 𝑥))
32pm2.43i 52 . . . 4 (𝑦 = 𝑥𝑥 = 𝑥)
43con3i 157 . . 3 𝑥 = 𝑥 → ¬ 𝑦 = 𝑥)
54alimi 1819 . 2 (∀𝑦 ¬ 𝑥 = 𝑥 → ∀𝑦 ¬ 𝑦 = 𝑥)
61, 5mto 200 1 ¬ ∀𝑦 ¬ 𝑥 = 𝑥
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wal 1541
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-c7 36636  ax-c10 36637
This theorem depends on definitions:  df-bi 210  df-an 400  df-ex 1788
This theorem is referenced by:  axc5sp1  36674  equidq  36675
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