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Theorem setsabsd 12717
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 12716 . . . 4  |-  ( ( S  e.  V  /\  A  e.  W  /\  B  e.  X )  ->  ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  =  ( S  |`  ( _V  \  { A }
) ) )
51, 2, 3, 4syl3anc 1249 . . 3  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  =  ( S  |`  ( _V  \  { A }
) ) )
65uneq1d 3316 . 2  |-  ( ph  ->  ( ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  u. 
{ <. A ,  C >. } )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
7 setsex 12710 . . . 4  |-  ( ( S  e.  V  /\  A  e.  W  /\  B  e.  X )  ->  ( S sSet  <. A ,  B >. )  e.  _V )
81, 2, 3, 7syl3anc 1249 . . 3  |-  ( ph  ->  ( S sSet  <. A ,  B >. )  e.  _V )
9 setsabsd.c . . 3  |-  ( ph  ->  C  e.  U )
10 setsvala 12709 . . 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 1249 . 2  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. ) sSet  <. A ,  C >. )  =  ( ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  u.  { <. A ,  C >. } ) )
12 setsvala 12709 . . 3  |-  ( ( S  e.  V  /\  A  e.  W  /\  C  e.  U )  ->  ( S sSet  <. A ,  C >. )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
131, 2, 9, 12syl3anc 1249 . 2  |-  ( ph  ->  ( S sSet  <. A ,  C >. )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
146, 11, 133eqtr4d 2239 1  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. ) sSet  <. A ,  C >. )  =  ( S sSet  <. A ,  C >. )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1364    e. wcel 2167   _Vcvv 2763    \ cdif 3154    u. cun 3155   {csn 3622   <.cop 3625    |` cres 4665  (class class class)co 5922   sSet csts 12676
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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242  ax-un 4468  ax-setind 4573
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-ral 2480  df-rex 2481  df-rab 2484  df-v 2765  df-sbc 2990  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-nul 3451  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-opab 4095  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-res 4675  df-iota 5219  df-fun 5260  df-fv 5266  df-ov 5925  df-oprab 5926  df-mpo 5927  df-sets 12685
This theorem is referenced by:  ressressg  12753
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