Theorem neeqtrrd 2229

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

Hypotheses

Ref	Expression
neeqtrrd.1	⊢ (φ → A ≠ B)
neeqtrrd.2	⊢ (φ → 𝐶 = B)

Assertion

Ref	Expression
neeqtrrd	⊢ (φ → A ≠ 𝐶)

Proof of Theorem neeqtrrd

Step	Hyp	Ref	Expression
1		neeqtrrd.1	. 2 ⊢ (φ → A ≠ B)
2		neeqtrrd.2	. . 3 ⊢ (φ → 𝐶 = B)
3	2	eqcomd 2042	. 2 ⊢ (φ → B = 𝐶)
4	1, 3	neeqtrd 2227	1 ⊢ (φ → A ≠ 𝐶)

Syntax hints:   → wi 4   = wceq 1242   ≠ wne 2201

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-5 1333  ax-gen 1335  ax-4 1397  ax-17 1416  ax-ext 2019

This theorem depends on definitions:  df-bi 110  df-cleq 2030  df-ne 2203

This theorem is referenced by: (None)