Theorem eqnetri 2383

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 2375	. 2 ⊢ (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)
4	1, 3	mpbir 146	1 ⊢ 𝐴 ≠ 𝐶

Syntax hints:   = wceq 1364   ≠ wne 2360

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 615  ax-in2 616  ax-5 1458  ax-gen 1460  ax-4 1521  ax-17 1537  ax-ext 2171

This theorem depends on definitions:  df-bi 117  df-cleq 2182  df-ne 2361

This theorem is referenced by:  eqnetrri  2385  2on0  6445  1n0  6451  basendxnplusgndx  12602  plusgndxnmulrndx  12610  basendxnmulrndx  12611