Theorem nfcsbw 3085

Description: Bound-variable hypothesis builder for substitution into a class. Version of nfcsb 3086 with a disjoint variable condition. (Contributed by Mario Carneiro, 12-Oct-2016.) (Revised by Gino Giotto, 10-Jan-2024.)

Hypotheses

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

Assertion

Ref	Expression
nfcsbw	|- F/_ x [_ A / y ]_ B

Distinct variable group:   x, y

Allowed substitution hints:   A( x, y)   B( x, y)

Proof of Theorem nfcsbw

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-csb 3050	. . 3 |- [_ A / y ]_ B = { z | [. A / y ]. z e. B }
2		nftru 1459	. . . 4 |- F/ z T.
3		nftru 1459	. . . . 5 |- F/ y T.
4		nfcsbw.1	. . . . . 6 |- F/_ x A
5	4	a1i 9	. . . . 5 |- ( T. -> F/_ x A )
6		nfcsbw.2	. . . . . . 7 |- F/_ x B
7	6	a1i 9	. . . . . 6 |- ( T. -> F/_ x B )
8	7	nfcrd 2326	. . . . 5 |- ( T. -> F/ x z e. B )
9	3, 5, 8	nfsbcdw 3083	. . . 4 |- ( T. -> F/ x [. A / y ]. z e. B )
10	2, 9	nfabdw 2331	. . 3 |- ( T. -> F/_ x { z | [. A / y ]. z e. B } )
11	1, 10	nfcxfrd 2310	. 2 |- ( T. -> F/_ x [_ A / y ]_ B )
12	11	mptru 1357	1 |- F/_ x [_ A / y ]_ B

Syntax hints:   T. wtru 1349   e. wcel 2141   {cab 2156   F/_wnfc 2299   [.wsbc 2955   [_csb 3049

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-11 1499  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-ext 2152

This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-sbc 2956  df-csb 3050

This theorem is referenced by:  fprod2dlemstep  11585  fprodcom2fi  11589