Theorem eqnetrd 2424

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 2418	. 2 ⊢ (𝜑 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶))
4	1, 3	mpbird 167	1 ⊢ (𝜑 → 𝐴 ≠ 𝐶)

Syntax hints:   → wi 4   = wceq 1395   ≠ wne 2400

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 617  ax-in2 618  ax-5 1493  ax-gen 1495  ax-4 1556  ax-17 1572  ax-ext 2211

This theorem depends on definitions:  df-bi 117  df-cleq 2222  df-ne 2401

This theorem is referenced by:  eqnetrrd  2426  ifnetruedc  3647  ifnefals  3648  frecabcl  6558  frecsuclem  6565  omp1eomlem  7282  xaddnemnf  10080  xaddnepnf  10081  hashprg  11059  bezoutr1  12591  phibndlem  12775  dfphi2  12779  lgsne0  15754  2sqlem8a  15838  2sqlem8  15839