Theorem neir 2949

Description: Inference associated with df-ne 2947. (Contributed by BJ, 7-Jul-2018.)

Hypothesis

Ref	Expression
neir.1	⊢ ¬ 𝐴 = 𝐵

Assertion

Ref	Expression
neir	⊢ 𝐴 ≠ 𝐵

Proof of Theorem neir

Step	Hyp	Ref	Expression
1		neir.1	. 2 ⊢ ¬ 𝐴 = 𝐵
2		df-ne 2947	. 2 ⊢ (𝐴 ≠ 𝐵 ↔ ¬ 𝐴 = 𝐵)
3	1, 2	mpbir 231	1 ⊢ 𝐴 ≠ 𝐵

Syntax hints:  ¬ wn 3   = wceq 1537   ≠ wne 2946

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 207  df-ne 2947

This theorem is referenced by:  nesymir  3005  vn0  4368  nsuceq0  6478  onnev  6522  nlim2  8546  ax1ne0  11229  ine0  11725  nosgnn0i  27722  1nei  32750  bj-pinftynminfty  37193