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Theorem isoini 6588
Description: Isomorphisms preserve initial segments. Proposition 6.31(2) of [TakeutiZaring] p. 33. (Contributed by NM, 20-Apr-2004.)
Assertion
Ref Expression
isoini  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  ( H " ( A  i^i  ( `' R " { D } ) ) )  =  ( B  i^i  ( `' S " { ( H `  D ) } ) ) )

Proof of Theorem isoini
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elin 3796 . . . 4  |-  ( y  e.  ( B  i^i  ( `' S " { ( H `  D ) } ) )  <->  ( y  e.  B  /\  y  e.  ( `' S " { ( H `  D ) } ) ) )
2 isof1o 6573 . . . . . . . . 9  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  H : A -1-1-onto-> B
)
3 f1ofo 6144 . . . . . . . . 9  |-  ( H : A -1-1-onto-> B  ->  H : A -onto-> B )
4 forn 6118 . . . . . . . . . 10  |-  ( H : A -onto-> B  ->  ran  H  =  B )
54eleq2d 2687 . . . . . . . . 9  |-  ( H : A -onto-> B  -> 
( y  e.  ran  H  <-> 
y  e.  B ) )
62, 3, 53syl 18 . . . . . . . 8  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( y  e. 
ran  H  <->  y  e.  B
) )
7 f1ofn 6138 . . . . . . . . 9  |-  ( H : A -1-1-onto-> B  ->  H  Fn  A )
8 fvelrnb 6243 . . . . . . . . 9  |-  ( H  Fn  A  ->  (
y  e.  ran  H  <->  E. x  e.  A  ( H `  x )  =  y ) )
92, 7, 83syl 18 . . . . . . . 8  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( y  e. 
ran  H  <->  E. x  e.  A  ( H `  x )  =  y ) )
106, 9bitr3d 270 . . . . . . 7  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( y  e.  B  <->  E. x  e.  A  ( H `  x )  =  y ) )
11 fvex 6201 . . . . . . . 8  |-  ( H `
 D )  e. 
_V
12 vex 3203 . . . . . . . . 9  |-  y  e. 
_V
1312eliniseg 5494 . . . . . . . 8  |-  ( ( H `  D )  e.  _V  ->  (
y  e.  ( `' S " { ( H `  D ) } )  <->  y S
( H `  D
) ) )
1411, 13mp1i 13 . . . . . . 7  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( y  e.  ( `' S " { ( H `  D ) } )  <-> 
y S ( H `
 D ) ) )
1510, 14anbi12d 747 . . . . . 6  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( ( y  e.  B  /\  y  e.  ( `' S " { ( H `  D ) } ) )  <->  ( E. x  e.  A  ( H `  x )  =  y  /\  y S ( H `  D ) ) ) )
1615adantr 481 . . . . 5  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
( y  e.  B  /\  y  e.  ( `' S " { ( H `  D ) } ) )  <->  ( E. x  e.  A  ( H `  x )  =  y  /\  y S ( H `  D ) ) ) )
17 elin 3796 . . . . . . . . . . . 12  |-  ( x  e.  ( A  i^i  ( `' R " { D } ) )  <->  ( x  e.  A  /\  x  e.  ( `' R " { D } ) ) )
18 vex 3203 . . . . . . . . . . . . . 14  |-  x  e. 
_V
1918eliniseg 5494 . . . . . . . . . . . . 13  |-  ( D  e.  A  ->  (
x  e.  ( `' R " { D } )  <->  x R D ) )
2019anbi2d 740 . . . . . . . . . . . 12  |-  ( D  e.  A  ->  (
( x  e.  A  /\  x  e.  ( `' R " { D } ) )  <->  ( x  e.  A  /\  x R D ) ) )
2117, 20syl5bb 272 . . . . . . . . . . 11  |-  ( D  e.  A  ->  (
x  e.  ( A  i^i  ( `' R " { D } ) )  <->  ( x  e.  A  /\  x R D ) ) )
2221anbi1d 741 . . . . . . . . . 10  |-  ( D  e.  A  ->  (
( x  e.  ( A  i^i  ( `' R " { D } ) )  /\  x H y )  <->  ( (
x  e.  A  /\  x R D )  /\  x H y ) ) )
23 anass 681 . . . . . . . . . 10  |-  ( ( ( x  e.  A  /\  x R D )  /\  x H y )  <->  ( x  e.  A  /\  ( x R D  /\  x H y ) ) )
2422, 23syl6bb 276 . . . . . . . . 9  |-  ( D  e.  A  ->  (
( x  e.  ( A  i^i  ( `' R " { D } ) )  /\  x H y )  <->  ( x  e.  A  /\  (
x R D  /\  x H y ) ) ) )
2524adantl 482 . . . . . . . 8  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
( x  e.  ( A  i^i  ( `' R " { D } ) )  /\  x H y )  <->  ( x  e.  A  /\  (
x R D  /\  x H y ) ) ) )
26 isorel 6576 . . . . . . . . . . . . . 14  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  (
x  e.  A  /\  D  e.  A )
)  ->  ( x R D  <->  ( H `  x ) S ( H `  D ) ) )
272, 7syl 17 . . . . . . . . . . . . . . . 16  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  H  Fn  A
)
28 fnbrfvb 6236 . . . . . . . . . . . . . . . . 17  |-  ( ( H  Fn  A  /\  x  e.  A )  ->  ( ( H `  x )  =  y  <-> 
x H y ) )
2928bicomd 213 . . . . . . . . . . . . . . . 16  |-  ( ( H  Fn  A  /\  x  e.  A )  ->  ( x H y  <-> 
( H `  x
)  =  y ) )
3027, 29sylan 488 . . . . . . . . . . . . . . 15  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  x  e.  A )  ->  (
x H y  <->  ( H `  x )  =  y ) )
3130adantrr 753 . . . . . . . . . . . . . 14  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  (
x  e.  A  /\  D  e.  A )
)  ->  ( x H y  <->  ( H `  x )  =  y ) )
3226, 31anbi12d 747 . . . . . . . . . . . . 13  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  (
x  e.  A  /\  D  e.  A )
)  ->  ( (
x R D  /\  x H y )  <->  ( ( H `  x ) S ( H `  D )  /\  ( H `  x )  =  y ) ) )
33 ancom 466 . . . . . . . . . . . . . 14  |-  ( ( ( H `  x
) S ( H `
 D )  /\  ( H `  x )  =  y )  <->  ( ( H `  x )  =  y  /\  ( H `  x ) S ( H `  D ) ) )
34 breq1 4656 . . . . . . . . . . . . . . 15  |-  ( ( H `  x )  =  y  ->  (
( H `  x
) S ( H `
 D )  <->  y S
( H `  D
) ) )
3534pm5.32i 669 . . . . . . . . . . . . . 14  |-  ( ( ( H `  x
)  =  y  /\  ( H `  x ) S ( H `  D ) )  <->  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) )
3633, 35bitri 264 . . . . . . . . . . . . 13  |-  ( ( ( H `  x
) S ( H `
 D )  /\  ( H `  x )  =  y )  <->  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) )
3732, 36syl6bb 276 . . . . . . . . . . . 12  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  (
x  e.  A  /\  D  e.  A )
)  ->  ( (
x R D  /\  x H y )  <->  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) ) )
3837exp32 631 . . . . . . . . . . 11  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( x  e.  A  ->  ( D  e.  A  ->  ( ( x R D  /\  x H y )  <->  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) ) ) ) )
3938com23 86 . . . . . . . . . 10  |-  ( H 
Isom  R ,  S  ( A ,  B )  ->  ( D  e.  A  ->  ( x  e.  A  ->  ( ( x R D  /\  x H y )  <->  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) ) ) ) )
4039imp 445 . . . . . . . . 9  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
x  e.  A  -> 
( ( x R D  /\  x H y )  <->  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) ) ) )
4140pm5.32d 671 . . . . . . . 8  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
( x  e.  A  /\  ( x R D  /\  x H y ) )  <->  ( x  e.  A  /\  (
( H `  x
)  =  y  /\  y S ( H `  D ) ) ) ) )
4225, 41bitrd 268 . . . . . . 7  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
( x  e.  ( A  i^i  ( `' R " { D } ) )  /\  x H y )  <->  ( x  e.  A  /\  (
( H `  x
)  =  y  /\  y S ( H `  D ) ) ) ) )
4342rexbidv2 3048 . . . . . 6  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  ( E. x  e.  ( A  i^i  ( `' R " { D } ) ) x H y  <->  E. x  e.  A  ( ( H `  x )  =  y  /\  y S ( H `  D ) ) ) )
44 r19.41v 3089 . . . . . 6  |-  ( E. x  e.  A  ( ( H `  x
)  =  y  /\  y S ( H `  D ) )  <->  ( E. x  e.  A  ( H `  x )  =  y  /\  y S ( H `  D ) ) )
4543, 44syl6bb 276 . . . . 5  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  ( E. x  e.  ( A  i^i  ( `' R " { D } ) ) x H y  <-> 
( E. x  e.  A  ( H `  x )  =  y  /\  y S ( H `  D ) ) ) )
4616, 45bitr4d 271 . . . 4  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
( y  e.  B  /\  y  e.  ( `' S " { ( H `  D ) } ) )  <->  E. x  e.  ( A  i^i  ( `' R " { D } ) ) x H y ) )
471, 46syl5bb 272 . . 3  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  (
y  e.  ( B  i^i  ( `' S " { ( H `  D ) } ) )  <->  E. x  e.  ( A  i^i  ( `' R " { D } ) ) x H y ) )
4847abbi2dv 2742 . 2  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  ( B  i^i  ( `' S " { ( H `  D ) } ) )  =  { y  |  E. x  e.  ( A  i^i  ( `' R " { D } ) ) x H y } )
49 dfima2 5468 . 2  |-  ( H
" ( A  i^i  ( `' R " { D } ) ) )  =  { y  |  E. x  e.  ( A  i^i  ( `' R " { D } ) ) x H y }
5048, 49syl6reqr 2675 1  |-  ( ( H  Isom  R ,  S  ( A ,  B )  /\  D  e.  A )  ->  ( H " ( A  i^i  ( `' R " { D } ) ) )  =  ( B  i^i  ( `' S " { ( H `  D ) } ) ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 196    /\ wa 384    = wceq 1483    e. wcel 1990   {cab 2608   E.wrex 2913   _Vcvv 3200    i^i cin 3573   {csn 4177   class class class wbr 4653   `'ccnv 5113   ran crn 5115   "cima 5117    Fn wfn 5883   -onto->wfo 5886   -1-1-onto->wf1o 5887   ` cfv 5888    Isom wiso 5889
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-isom 5897
This theorem is referenced by:  isoini2  6589  isoselem  6591  infxpenlem  8836
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