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Theorem setsabsd 12956
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 12955 . . . 4  |-  ( ( S  e.  V  /\  A  e.  W  /\  B  e.  X )  ->  ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  =  ( S  |`  ( _V  \  { A }
) ) )
51, 2, 3, 4syl3anc 1250 . . 3  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  =  ( S  |`  ( _V  \  { A }
) ) )
65uneq1d 3330 . 2  |-  ( ph  ->  ( ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  u. 
{ <. A ,  C >. } )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
7 setsex 12949 . . . 4  |-  ( ( S  e.  V  /\  A  e.  W  /\  B  e.  X )  ->  ( S sSet  <. A ,  B >. )  e.  _V )
81, 2, 3, 7syl3anc 1250 . . 3  |-  ( ph  ->  ( S sSet  <. A ,  B >. )  e.  _V )
9 setsabsd.c . . 3  |-  ( ph  ->  C  e.  U )
10 setsvala 12948 . . 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 1250 . 2  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. ) sSet  <. A ,  C >. )  =  ( ( ( S sSet  <. A ,  B >. )  |`  ( _V  \  { A } ) )  u.  { <. A ,  C >. } ) )
12 setsvala 12948 . . 3  |-  ( ( S  e.  V  /\  A  e.  W  /\  C  e.  U )  ->  ( S sSet  <. A ,  C >. )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
131, 2, 9, 12syl3anc 1250 . 2  |-  ( ph  ->  ( S sSet  <. A ,  C >. )  =  ( ( S  |`  ( _V  \  { A }
) )  u.  { <. A ,  C >. } ) )
146, 11, 133eqtr4d 2249 1  |-  ( ph  ->  ( ( S sSet  <. A ,  B >. ) sSet  <. A ,  C >. )  =  ( S sSet  <. A ,  C >. )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1373    e. wcel 2177   _Vcvv 2773    \ cdif 3167    u. cun 3168   {csn 3638   <.cop 3641    |` cres 4690  (class class class)co 5962   sSet csts 12915
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2179  ax-14 2180  ax-ext 2188  ax-sep 4173  ax-pow 4229  ax-pr 4264  ax-un 4493  ax-setind 4598
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ne 2378  df-ral 2490  df-rex 2491  df-rab 2494  df-v 2775  df-sbc 3003  df-dif 3172  df-un 3174  df-in 3176  df-ss 3183  df-nul 3465  df-pw 3623  df-sn 3644  df-pr 3645  df-op 3647  df-uni 3860  df-br 4055  df-opab 4117  df-id 4353  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-res 4700  df-iota 5246  df-fun 5287  df-fv 5293  df-ov 5965  df-oprab 5966  df-mpo 5967  df-sets 12924
This theorem is referenced by:  ressressg  12992
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