Theorem eqnetrd 2438

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

Step	Hyp	Ref	Expression
1		eqnetrd.2	. 2 ⊢ (𝜑 → 𝐵 ≠ 𝐶)
2		eqnetrd.1	. . 3 ⊢ (𝜑 → 𝐴 = 𝐵)
3	2	neeq1d 2432	. 2 ⊢ (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶))
4	1, 3	mpbird 167	1 ⊢ (𝜑 → 𝐴 ≠ 𝐶)

Syntax hints:   → wi 4   = wceq 1398   ≠ wne 2414

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-5 1496  ax-gen 1498  ax-4 1559  ax-17 1575  ax-ext 2216

This theorem depends on definitions:  df-bi 117  df-cleq 2227  df-ne 2415

This theorem is referenced by:  eqnetrrd  2440  ifnetruedc  3670  ifnefals  3671  frecabcl  6643  frecsuclem  6650  omp1eomlem  7398  xaddnemnf  10209  xaddnepnf  10210  hashprg  11198  bezoutr1  12754  phibndlem  12938  dfphi2  12942  lgsne0  16037  2sqlem8a  16121  2sqlem8  16122