Theorem nesymir 3015

Description: Inference associated with nesym 3013. (Contributed by BJ, 7-Jul-2018.) (Proof shortened by Wolf Lammen, 25-Nov-2019.)

Hypothesis

Ref	Expression
nesymir.1	⊢ ¬ 𝐴 = 𝐵

Assertion

Ref	Expression
nesymir	⊢ 𝐵 ≠ 𝐴

Proof of Theorem nesymir

Step	Hyp	Ref	Expression
1		nesymir.1	. . 3 ⊢ ¬ 𝐴 = 𝐵
2	1	neir 2960	. 2 ⊢ 𝐴 ≠ 𝐵
3	2	necomi 3011	1 ⊢ 𝐵 ≠ 𝐴

This proof depends on syntax axioms:  ¬ wn 3   = wceq 1569   ≠ wne 2957

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1824  ax-4 1838  ax-5 1939  ax-6 1996  ax-7 2037  ax-9 2152  ax-ext 2734

This proof depends on definitions:  df-bi 210  df-an 401  df-ex 1809  df-cleq 2754  df-ne 2958

This theorem is used by:  relowlpssretop  38038