Theorem neneq 2369

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 2368	1 |- ( A =/= B -> -. A = B )

Syntax hints:   -. wn 3   -> wi 4   = wceq 1353   =/= wne 2347

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106

This theorem depends on definitions:  df-bi 117  df-ne 2348

This theorem is referenced by:  mpodifsnif  5965  gcd2n0cl  11962  isnsgrp  12744  lgsabs1  14311