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Theorem neleq12d 3040
 Description: Equality theorem for negated membership. (Contributed by FL, 10-Aug-2016.) (Proof shortened by Wolf Lammen, 25-Nov-2019.)
Hypotheses
Ref Expression
neleq12d.1 (𝜑𝐴 = 𝐵)
neleq12d.2 (𝜑𝐶 = 𝐷)
Assertion
Ref Expression
neleq12d (𝜑 → (𝐴𝐶𝐵𝐷))

Proof of Theorem neleq12d
StepHypRef Expression
1 neleq12d.1 . . . 4 (𝜑𝐴 = 𝐵)
2 neleq12d.2 . . . 4 (𝜑𝐶 = 𝐷)
31, 2eleq12d 2834 . . 3 (𝜑 → (𝐴𝐶𝐵𝐷))
43notbid 307 . 2 (𝜑 → (¬ 𝐴𝐶 ↔ ¬ 𝐵𝐷))
5 df-nel 3037 . 2 (𝐴𝐶 ↔ ¬ 𝐴𝐶)
6 df-nel 3037 . 2 (𝐵𝐷 ↔ ¬ 𝐵𝐷)
74, 5, 63bitr4g 303 1 (𝜑 → (𝐴𝐶𝐵𝐷))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   = wceq 1632   ∈ wcel 2140   ∉ wnel 3036 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1989  ax-6 2055  ax-7 2091  ax-9 2149  ax-ext 2741 This theorem depends on definitions:  df-bi 197  df-an 385  df-ex 1854  df-cleq 2754  df-clel 2757  df-nel 3037 This theorem is referenced by:  neleq1  3041  neleq2  3042  uhgrspan1  26416  nbgrnself  26476  nbgrnself2  26477  nbgrnself2OLD  26480  finsumvtxdg2size  26678
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