Theorem neldifsnd 3804

Description: A is not in ( B \ { A } ). Deduction form. (Contributed by David Moews, 1-May-2017.)

Assertion

Ref	Expression
neldifsnd	|- ( ph -> -. A e. ( B \ { A } ) )

Proof of Theorem neldifsnd

Step	Hyp	Ref	Expression
1		neldifsn 3803	. 2 |- -. A e. ( B \ { A } )
2	1	a1i 9	1 |- ( ph -> -. A e. ( B \ { A } ) )

Syntax hints:   -. wn 3   -> wi 4   e. wcel 2202   \ cdif 3197   {csn 3669

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-v 2804  df-dif 3202  df-sn 3675

This theorem is referenced by:  difsnb  3816  frirrg  4447  elirr  4639