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Theorem elnelne1 3051
Description: Two classes are different if they don't contain the same element. (Contributed by AV, 28-Jan-2020.)
Assertion
Ref Expression
elnelne1 ((𝐴𝐵𝐴𝐶) → 𝐵𝐶)

Proof of Theorem elnelne1
StepHypRef Expression
1 df-nel 3041 . 2 (𝐴𝐶 ↔ ¬ 𝐴𝐶)
2 nelne1 3033 . 2 ((𝐴𝐵 ∧ ¬ 𝐴𝐶) → 𝐵𝐶)
31, 2sylan2b 593 1 ((𝐴𝐵𝐴𝐶) → 𝐵𝐶)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 395  wcel 2098  wne 2934  wnel 3040
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2697
This theorem depends on definitions:  df-bi 206  df-an 396  df-ex 1774  df-cleq 2718  df-clel 2804  df-ne 2935  df-nel 3041
This theorem is referenced by:  sticksstones1  41520
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