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Theorem naecoms-o 33030
Description: A commutation rule for distinct variable specifiers. Version of naecoms 2297 using ax-c11 32990. (Contributed by NM, 2-Jan-2002.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
nalequcoms-o.1 (¬ ∀𝑥 𝑥 = 𝑦𝜑)
Assertion
Ref Expression
naecoms-o (¬ ∀𝑦 𝑦 = 𝑥𝜑)

Proof of Theorem naecoms-o
StepHypRef Expression
1 aecom-o 33004 . . 3 (∀𝑥 𝑥 = 𝑦 → ∀𝑦 𝑦 = 𝑥)
2 nalequcoms-o.1 . . 3 (¬ ∀𝑥 𝑥 = 𝑦𝜑)
31, 2nsyl4 154 . 2 𝜑 → ∀𝑦 𝑦 = 𝑥)
43con1i 142 1 (¬ ∀𝑦 𝑦 = 𝑥𝜑)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wal 1472
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-c5 32986  ax-c4 32987  ax-c7 32988  ax-c10 32989  ax-c11 32990  ax-c9 32993
This theorem depends on definitions:  df-bi 195  df-an 384  df-ex 1695
This theorem is referenced by:  ax12inda2ALT  33049
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