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Theorem setsabsd 12504
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
StepHypRef 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 12503 . . . 4  |-  ( ( S  e.  V  /\  A  e.  W  /\  B  e.  X )  ->  ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  =  ( S  |`  ( _V  \  { A }
) ) )
51, 2, 3, 4syl3anc 1238 . . 3  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  =  ( S  |`  ( _V  \  { A }
) ) )
65uneq1d 3290 . 2  |-  ( ph  ->  ( ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  u. 
{ <. A ,  C >. } )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
7 setsex 12497 . . . 4  |-  ( ( S  e.  V  /\  A  e.  W  /\  B  e.  X )  ->  ( S sSet  <. A ,  B >. )  e.  _V )
81, 2, 3, 7syl3anc 1238 . . 3  |-  ( ph  ->  ( S sSet  <. A ,  B >. )  e.  _V )
9 setsabsd.c . . 3  |-  ( ph  ->  C  e.  U )
10 setsvala 12496 . . 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 >. } ) )
118, 2, 9, 10syl3anc 1238 . 2  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. ) sSet  <. A ,  C >. )  =  ( ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  u.  { <. A ,  C >. } ) )
12 setsvala 12496 . . 3  |-  ( ( S  e.  V  /\  A  e.  W  /\  C  e.  U )  ->  ( S sSet  <. A ,  C >. )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
131, 2, 9, 12syl3anc 1238 . 2  |-  ( ph  ->  ( S sSet  <. A ,  C >. )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
146, 11, 133eqtr4d 2220 1  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. ) sSet  <. A ,  C >. )  =  ( S sSet  <. A ,  C >. )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1353    e. wcel 2148   _Vcvv 2739    \ cdif 3128    u. cun 3129   {csn 3594   <.cop 3597    |` cres 4630  (class class class)co 5878   sSet csts 12463
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435  ax-setind 4538
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2741  df-sbc 2965  df-dif 3133  df-un 3135  df-in 3137  df-ss 3144  df-nul 3425  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-opab 4067  df-id 4295  df-xp 4634  df-rel 4635  df-cnv 4636  df-co 4637  df-dm 4638  df-res 4640  df-iota 5180  df-fun 5220  df-fv 5226  df-ov 5881  df-oprab 5882  df-mpo 5883  df-sets 12472
This theorem is referenced by:  ressressg  12537
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