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Theorem riotasv2d 6523
Description: Value of description binder  D for a single-valued class expression  C ( y ) (as in e.g. reusv2 4662). Special case of riota2f 6500. (Contributed by NM, 2-Mar-2013.)
Hypotheses
Ref Expression
riotasv2d.1  |-  F/ y
ph
riotasv2d.2  |-  ( ph  -> 
F/_ y F )
riotasv2d.3  |-  ( ph  ->  F/ y ch )
riotasv2d.4  |-  ( ph  ->  D  =  ( iota_ x  e.  A A. y  e.  B  ( ps  ->  x  =  C ) ) )
riotasv2d.5  |-  ( (
ph  /\  y  =  E )  ->  ( ps 
<->  ch ) )
riotasv2d.6  |-  ( (
ph  /\  y  =  E )  ->  C  =  F )
riotasv2d.7  |-  ( ph  ->  D  e.  A )
riotasv2d.8  |-  ( ph  ->  E  e.  B )
riotasv2d.9  |-  ( ph  ->  ch )
Assertion
Ref Expression
riotasv2d  |-  ( (
ph  /\  A  e.  V )  ->  D  =  F )
Distinct variable groups:    x, y, A    x, B, y    x, C    y, E    ps, x
Allowed substitution hints:    ph( x, y)    ps( y)    ch( x, y)    C( y)    D( x, y)    E( x)    F( x, y)    V( x, y)

Proof of Theorem riotasv2d
StepHypRef Expression
1 elex 2900 . 2  |-  ( A  e.  V  ->  A  e.  _V )
2 riotasv2d.8 . . . 4  |-  ( ph  ->  E  e.  B )
32adantr 452 . . 3  |-  ( (
ph  /\  A  e.  _V )  ->  E  e.  B )
4 riotasv2d.9 . . . 4  |-  ( ph  ->  ch )
54adantr 452 . . 3  |-  ( (
ph  /\  A  e.  _V )  ->  ch )
6 eleq1 2440 . . . . . . . 8  |-  ( y  =  E  ->  (
y  e.  B  <->  E  e.  B ) )
76adantl 453 . . . . . . 7  |-  ( (
ph  /\  y  =  E )  ->  (
y  e.  B  <->  E  e.  B ) )
8 riotasv2d.5 . . . . . . 7  |-  ( (
ph  /\  y  =  E )  ->  ( ps 
<->  ch ) )
97, 8anbi12d 692 . . . . . 6  |-  ( (
ph  /\  y  =  E )  ->  (
( y  e.  B  /\  ps )  <->  ( E  e.  B  /\  ch )
) )
10 riotasv2d.6 . . . . . . 7  |-  ( (
ph  /\  y  =  E )  ->  C  =  F )
1110eqeq2d 2391 . . . . . 6  |-  ( (
ph  /\  y  =  E )  ->  ( D  =  C  <->  D  =  F ) )
129, 11imbi12d 312 . . . . 5  |-  ( (
ph  /\  y  =  E )  ->  (
( ( y  e.  B  /\  ps )  ->  D  =  C )  <-> 
( ( E  e.  B  /\  ch )  ->  D  =  F ) ) )
1312adantlr 696 . . . 4  |-  ( ( ( ph  /\  A  e.  _V )  /\  y  =  E )  ->  (
( ( y  e.  B  /\  ps )  ->  D  =  C )  <-> 
( ( E  e.  B  /\  ch )  ->  D  =  F ) ) )
14 riotasv2d.4 . . . . 5  |-  ( ph  ->  D  =  ( iota_ x  e.  A A. y  e.  B  ( ps  ->  x  =  C ) ) )
15 riotasv2d.7 . . . . 5  |-  ( ph  ->  D  e.  A )
1614, 15riotasvd 6521 . . . 4  |-  ( (
ph  /\  A  e.  _V )  ->  ( ( y  e.  B  /\  ps )  ->  D  =  C ) )
17 riotasv2d.1 . . . . 5  |-  F/ y
ph
18 nfv 1626 . . . . 5  |-  F/ y  A  e.  _V
1917, 18nfan 1836 . . . 4  |-  F/ y ( ph  /\  A  e.  _V )
20 nfcvd 2517 . . . 4  |-  ( (
ph  /\  A  e.  _V )  ->  F/_ y E )
21 nfvd 1627 . . . . . . 7  |-  ( ph  ->  F/ y  E  e.  B )
22 riotasv2d.3 . . . . . . 7  |-  ( ph  ->  F/ y ch )
2321, 22nfand 1833 . . . . . 6  |-  ( ph  ->  F/ y ( E  e.  B  /\  ch ) )
24 nfra1 2692 . . . . . . . . 9  |-  F/ y A. y  e.  B  ( ps  ->  x  =  C )
25 nfcv 2516 . . . . . . . . 9  |-  F/_ y A
2624, 25nfriota 6488 . . . . . . . 8  |-  F/_ y
( iota_ x  e.  A A. y  e.  B  ( ps  ->  x  =  C ) )
2717, 14nfceqdf 2515 . . . . . . . 8  |-  ( ph  ->  ( F/_ y D  <->  F/_ y ( iota_ x  e.  A A. y  e.  B  ( ps  ->  x  =  C ) ) ) )
2826, 27mpbiri 225 . . . . . . 7  |-  ( ph  -> 
F/_ y D )
29 riotasv2d.2 . . . . . . 7  |-  ( ph  -> 
F/_ y F )
3028, 29nfeqd 2530 . . . . . 6  |-  ( ph  ->  F/ y  D  =  F )
3123, 30nfimd 1817 . . . . 5  |-  ( ph  ->  F/ y ( ( E  e.  B  /\  ch )  ->  D  =  F ) )
3231adantr 452 . . . 4  |-  ( (
ph  /\  A  e.  _V )  ->  F/ y ( ( E  e.  B  /\  ch )  ->  D  =  F ) )
333, 13, 16, 19, 20, 32vtocldf 2939 . . 3  |-  ( (
ph  /\  A  e.  _V )  ->  ( ( E  e.  B  /\  ch )  ->  D  =  F ) )
343, 5, 33mp2and 661 . 2  |-  ( (
ph  /\  A  e.  _V )  ->  D  =  F )
351, 34sylan2 461 1  |-  ( (
ph  /\  A  e.  V )  ->  D  =  F )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 177    /\ wa 359   F/wnf 1550    = wceq 1649    e. wcel 1717   F/_wnfc 2503   A.wral 2642   _Vcvv 2892   iota_crio 6471
This theorem is referenced by:  riotasv2s  6525  cdleme42b  30643
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1552  ax-5 1563  ax-17 1623  ax-9 1661  ax-8 1682  ax-13 1719  ax-14 1721  ax-6 1736  ax-7 1741  ax-11 1753  ax-12 1939  ax-ext 2361  ax-sep 4264  ax-nul 4272  ax-pow 4311  ax-pr 4337  ax-un 4634
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1325  df-ex 1548  df-nf 1551  df-sb 1656  df-eu 2235  df-mo 2236  df-clab 2367  df-cleq 2373  df-clel 2376  df-nfc 2505  df-ne 2545  df-nel 2546  df-ral 2647  df-rex 2648  df-reu 2649  df-rab 2651  df-v 2894  df-sbc 3098  df-dif 3259  df-un 3261  df-in 3263  df-ss 3270  df-nul 3565  df-if 3676  df-pw 3737  df-sn 3756  df-pr 3757  df-op 3759  df-uni 3951  df-br 4147  df-opab 4201  df-mpt 4202  df-id 4432  df-xp 4817  df-rel 4818  df-cnv 4819  df-co 4820  df-dm 4821  df-iota 5351  df-fun 5389  df-fv 5395  df-undef 6472  df-riota 6478
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