Theorem neneq 2442

Description: From inequality to non-equality. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

Assertion

Ref	Expression
neneq	|- ( A =/= B -> -. A = B )

Proof of Theorem neneq

Step	Hyp	Ref	Expression
1		id 19	. 2 |- ( A =/= B -> A =/= B )
2	1	neneqd 2441	1 |- ( A =/= B -> -. A = B )

This proof depends on syntax axioms:   -. wn 3   -> wi 4   = wceq 1402   =/= wne 2420

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106

This proof depends on definitions:  df-bi 117  df-ne 2421

This theorem is used by:  mpodifsnif  6181  gcd2n0cl  12746  isnsgrp  13721  lgsabs1  16158  structiedg0val  16281  umgr2edgneu  16453