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Theorem eqnetrd 2444
Description: Substitution of equal classes into an inequality. (Contributed by NM, 4-Jul-2012.)
Hypotheses
Ref Expression
eqnetrd.1 (𝜑 → 𝐴 = 𝐵)
eqnetrd.2 (𝜑 → 𝐵 ≠ 𝐶)
Assertion
Ref Expression
eqnetrd (𝜑 → 𝐴 ≠ 𝐶)

Proof of Theorem eqnetrd
StepHypRef Expression
1 eqnetrd.2 . 2 (𝜑 → 𝐵 ≠ 𝐶)
2 eqnetrd.1 . . 3 (𝜑 → 𝐴 = 𝐵)
32neeq1d 2438 . 2 (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶))
41, 3mpbird 167 1 (𝜑 → 𝐴 ≠ 𝐶)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   = wceq 1402   ≠ wne 2420
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-5 1500  ax-gen 1502  ax-4 1563  ax-17 1579  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-cleq 2231  df-ne 2421
This theorem is used by:  eqnetrrd  2446  ifnetruedc  3684  ifnefals  3685  frecabcl  6670  frecsuclem  6677  omp1eomlem  7435  xaddnemnf  10270  xaddnepnf  10271  hashprg  11265  bezoutr1  12829  phibndlem  13017  dfphi2  13021  lgsne0  16323  2sqlem8a  16407  2sqlem8  16408
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