Theorem eqnetri 2443

Description: Substitution of equal classes into an inequality. (Contributed by NM, 4-Jul-2012.)

Hypotheses

Ref	Expression
eqnetr.1	⊢ 𝐴 = 𝐵
eqnetr.2	⊢ 𝐵 ≠ 𝐶

Assertion

Ref	Expression
eqnetri	⊢ 𝐴 ≠ 𝐶

Proof of Theorem eqnetri

Step	Hyp	Ref	Expression
1		eqnetr.2	. 2 ⊢ 𝐵 ≠ 𝐶
2		eqnetr.1	. . 3 ⊢ 𝐴 = 𝐵
3	2	neeq1i 2435	. 2 ⊢ (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)
4	1, 3	mpbir 146	1 ⊢ 𝐴 ≠ 𝐶

Syntax hints:   = wceq 1402   ≠ wne 2420

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 623  ax-in2 624  ax-5 1500  ax-gen 1502  ax-4 1563  ax-17 1579  ax-ext 2220

This theorem depends on definitions:  df-bi 117  df-cleq 2231  df-ne 2421

This theorem is referenced by:  eqnetrri  2445  2on0  6691  1n0  6699  basendxnplusgndx  13462  plusgndxnmulrndx  13470  basendxnmulrndx  13471