Theorem sbcnel12g 2867

Description: Distribute proper substitution through negated membership. (Contributed by Andrew Salmon, 18-Jun-2011.)

Assertion

Ref	Expression
sbcnel12g	|- ( A e. V -> ( [. A / x ]. B e/ C <-> [_ A / x ]_ B e/ [_ A / x ]_ C ) )

Proof of Theorem sbcnel12g

Step	Hyp	Ref	Expression
1		df-nel 2207	. . . 4 |- ( B e/ C <-> -. B e. C )
2	1	sbcbii 2818	. . 3 |- ( [. A / x ]. B e/ C <-> [. A / x ]. -. B e. C )
3	2	a1i 9	. 2 |- ( A e. V -> ( [. A / x ]. B e/ C <-> [. A / x ]. -. B e. C ) )
4		sbcng 2803	. 2 |- ( A e. V -> ( [. A / x ]. -. B e. C <-> -. [. A / x ]. B e. C ) )
5		sbcel12g 2865	. . . 4 |- ( A e. V -> ( [. A / x ]. B e. C <-> [_ A / x ]_ B e. [_ A / x ]_ C ) )
6	5	notbid 592	. . 3 |- ( A e. V -> ( -. [. A / x ]. B e. C <-> -. [_ A / x ]_ B e. [_ A / x ]_ C ) )
7		df-nel 2207	. . 3 |- ( [_ A / x ]_ B e/ [_ A / x ]_ C <-> -. [_ A / x ]_ B e. [_ A / x ]_ C )
8	6, 7	syl6bbr 187	. 2 |- ( A e. V -> ( -. [. A / x ]. B e. C <-> [_ A / x ]_ B e/ [_ A / x ]_ C ) )
9	3, 4, 8	3bitrd 203	1 |- ( A e. V -> ( [. A / x ]. B e/ C <-> [_ A / x ]_ B e/ [_ A / x ]_ C ) )

Syntax hints:   -. wn 3   -> wi 4   <-> wb 98   e. wcel 1393   e/ wnel 2205   [.wsbc 2764   [_csb 2852

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022

This theorem depends on definitions:  df-bi 110  df-tru 1246  df-fal 1249  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-nel 2207  df-v 2559  df-sbc 2765  df-csb 2853

This theorem is referenced by: (None)