Theorem setsabsd 13111

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 13110	. . . 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 1271	. . 3 |- ( ph -> ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) = ( S |` ( _V \ { A } ) ) )
6	5	uneq1d 3358	. 2 |- ( ph -> ( ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) u. { <. A , C >. } ) = ( ( S |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
7		setsex 13104	. . . 4 |- ( ( S e. V /\ A e. W /\ B e. X ) -> ( S sSet <. A , B >. ) e. _V )
8	1, 2, 3, 7	syl3anc 1271	. . 3 |- ( ph -> ( S sSet <. A , B >. ) e. _V )
9		setsabsd.c	. . 3 |- ( ph -> C e. U )
10		setsvala 13103	. . 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 1271	. 2 |- ( ph -> ( ( S sSet <. A , B >. ) sSet <. A , C >. ) = ( ( ( S sSet <. A , B >. ) |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
12		setsvala 13103	. . 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 1271	. 2 |- ( ph -> ( S sSet <. A , C >. ) = ( ( S |` ( _V \ { A } ) ) u. { <. A , C >. } ) )
14	6, 11, 13	3eqtr4d 2272	1 |- ( ph -> ( ( S sSet <. A , B >. ) sSet <. A , C >. ) = ( S sSet <. A , C >. ) )

Syntax hints:   -> wi 4   = wceq 1395   e. wcel 2200   _Vcvv 2800   \ cdif 3195   u. cun 3196   {csn 3667   <.cop 3670   |` cres 4725  (class class class)co 6013   sSet csts 13070

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297  ax-un 4528  ax-setind 4633

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2802  df-sbc 3030  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-opab 4149  df-id 4388  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-res 4735  df-iota 5284  df-fun 5326  df-fv 5332  df-ov 6016  df-oprab 6017  df-mpo 6018  df-sets 13079

This theorem is referenced by:  ressressg  13148