Theorem nfne 2496

Description: Bound-variable hypothesis builder for inequality. (Contributed by NM, 10-Nov-2007.) (Revised by Mario Carneiro, 7-Oct-2016.)

Hypotheses

Ref	Expression
nfne.1	|- F/_ x A
nfne.2	|- F/_ x B

Assertion

Ref	Expression
nfne	|- F/ x A =/= B

Proof of Theorem nfne

Step	Hyp	Ref	Expression
1		df-ne 2404	. 2 |- ( A =/= B <-> -. A = B )
2		nfne.1	. . . 4 |- F/_ x A
3		nfne.2	. . . 4 |- F/_ x B
4	2, 3	nfeq 2383	. . 3 |- F/ x A = B
5	4	nfn 1706	. 2 |- F/ x -. A = B
6	1, 5	nfxfr 1523	1 |- F/ x A =/= B

Syntax hints:   -. wn 3   = wceq 1398   F/wnf 1509   F/_wnfc 2362   =/= wne 2403

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404

This theorem is referenced by: (None)