Theorem csbdmg 4970

Description: Distribute proper substitution through the domain of a class. (Contributed by Jim Kingdon, 8-Dec-2018.)

Assertion

Ref	Expression
csbdmg	|- ( A e. V -> [_ A / x ]_ dom B = dom [_ A / x ]_ B )

Proof of Theorem csbdmg

Dummy variables w y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		csbabg 3209	. . 3 |- ( A e. V -> [_ A / x ]_ { y | E. w <. y , w >. e. B } = { y | [. A / x ]. E. w <. y , w >. e. B } )
2		sbcex2 3105	. . . . 5 |- ( [. A / x ]. E. w <. y , w >. e. B <-> E. w [. A / x ]. <. y , w >. e. B )
3		sbcel2g 3168	. . . . . 6 |- ( A e. V -> ( [. A / x ]. <. y , w >. e. B <-> <. y , w >. e. [_ A / x ]_ B ) )
4	3	exbidv 1878	. . . . 5 |- ( A e. V -> ( E. w [. A / x ]. <. y , w >. e. B <-> E. w <. y , w >. e. [_ A / x ]_ B ) )
5	2, 4	bitrid 192	. . . 4 |- ( A e. V -> ( [. A / x ]. E. w <. y , w >. e. B <-> E. w <. y , w >. e. [_ A / x ]_ B ) )
6	5	abbidv 2358	. . 3 |- ( A e. V -> { y | [. A / x ]. E. w <. y , w >. e. B } = { y | E. w <. y , w >. e. [_ A / x ]_ B } )
7	1, 6	eqtrd 2271	. 2 |- ( A e. V -> [_ A / x ]_ { y | E. w <. y , w >. e. B } = { y | E. w <. y , w >. e. [_ A / x ]_ B } )
8		dfdm3 4962	. . 3 |- dom B = { y | E. w <. y , w >. e. B }
9	8	csbeq2i 3174	. 2 |- [_ A / x ]_ dom B = [_ A / x ]_ { y | E. w <. y , w >. e. B }
10		dfdm3 4962	. 2 |- dom [_ A / x ]_ B = { y | E. w <. y , w >. e. [_ A / x ]_ B }
11	7, 9, 10	3eqtr4g 2296	1 |- ( A e. V -> [_ A / x ]_ dom B = dom [_ A / x ]_ B )

Syntax hints:   -> wi 4   = wceq 1402   E.wex 1545   e. wcel 2209   {cab 2224   [.wsbc 3051   [_csb 3147   <.cop 3708   dom cdm 4769

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-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-sbc 3052  df-csb 3148  df-br 4126  df-dm 4779

This theorem is referenced by:  sbcfng  5526