Theorem necon3bii 2243

Description: Inference from equality to inequality. (Contributed by NM, 23-Feb-2005.)

Hypothesis

Ref	Expression
necon3bii.1	⊢ (𝐴 = 𝐵 ↔ 𝐶 = 𝐷)

Assertion

Ref	Expression
necon3bii	⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷)

Proof of Theorem necon3bii

Step	Hyp	Ref	Expression
1		necon3bii.1	. . 3 ⊢ (𝐴 = 𝐵 ↔ 𝐶 = 𝐷)
2	1	necon3abii 2241	. 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐶 = 𝐷)
3		df-ne 2206	. 2 ⊢ (𝐶 ≠ 𝐷 ↔ ¬ 𝐶 = 𝐷)
4	2, 3	bitr4i 176	1 ⊢ (𝐴 ≠ 𝐵 ↔ 𝐶 ≠ 𝐷)

Syntax hints:  ¬ wn 3   ↔ wb 98   = wceq 1243   ≠ wne 2204

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

This theorem depends on definitions:  df-bi 110  df-ne 2206

This theorem is referenced by:  necom  2289  negne0bi  7284