Theorem setsabsd 13369

Description: Replacing the same components twice yields the same as the second setting only. (Contributed by Mario Carneiro, 2-Dec-2014.) (Revised by Jim Kingdon, 22-Jan-2023.)

Hypotheses

Ref	Expression
setsabsd.s	|- ( ph -> S e. V )
setsabsd.a	|- ( ph -> A e. W )
setsabsd.b	|- ( ph -> B e. X )
setsabsd.c	|- ( ph -> C e. U )

Assertion

Ref	Expression
setsabsd	|- ( ph -> ( ( S sSet <. A , B >. ) sSet <. A , C >. ) = ( S sSet <. A , C >. ) )

Proof of Theorem setsabsd

Step	Hyp	Ref	Expression
1		setsabsd.s	. . . 4 |- ( ph -> S e. V )
2		setsabsd.a	. . . 4 |- ( ph -> A e. W )
3		setsabsd.b	. . . 4 |- ( ph -> B e. X )
4		setsresg 13368	. . . 4 |- ( ( S e. V /\ A e. W /\ B e. X ) -> ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) = ( S |` ( _V \ { A } ) ) )
5	1, 2, 3, 4	syl3anc 1278	. . 3 |- ( ph -> ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) = ( S |` ( _V \ { A } ) ) )
6	5	uneq1d 3382	. 2 |- ( ph -> ( ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) u. { <. A , C >. } ) = ( ( S |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
7		setsex 13362	. . . 4 |- ( ( S e. V /\ A e. W /\ B e. X ) -> ( S sSet <. A , B >. ) e. _V )
8	1, 2, 3, 7	syl3anc 1278	. . 3 |- ( ph -> ( S sSet <. A , B >. ) e. _V )
9		setsabsd.c	. . 3 |- ( ph -> C e. U )
10		setsvala 13361	. . 3 |- ( ( ( S sSet <. A , B >. ) e. _V /\ A e. W /\ C e. U ) -> ( ( S sSet <. A , B >. ) sSet <. A , C >. ) = ( ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
11	8, 2, 9, 10	syl3anc 1278	. 2 |- ( ph -> ( ( S sSet <. A , B >. ) sSet <. A , C >. ) = ( ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
12		setsvala 13361	. . 3 |- ( ( S e. V /\ A e. W /\ C e. U ) -> ( S sSet <. A , C >. ) = ( ( S |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
13	1, 2, 9, 12	syl3anc 1278	. 2 |- ( ph -> ( S sSet <. A , C >. ) = ( ( S |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
14	6, 11, 13	3eqtr4d 2281	1 |- ( ph -> ( ( S sSet <. A , B >. ) sSet <. A , C >. ) = ( S sSet <. A , C >. ) )

Syntax hints:   -> wi 4   = wceq 1402   e. wcel 2209   _Vcvv 2821   \ cdif 3217   u. cun 3218   {csn 3705   <.cop 3708   |` cres 4771  (class class class)co 6075   sSet csts 13328

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 623  ax-in2 624  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-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-res 4781  df-iota 5332  df-fun 5374  df-fv 5380  df-ov 6078  df-oprab 6079  df-mpo 6080  df-sets 13337

This theorem is referenced by:  ressressg  13406