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Theorem elrnmpt1 4928
Description: Elementhood in an image set. (Contributed by Mario Carneiro, 31-Aug-2015.)
Hypothesis
Ref Expression
rnmpt.1  |-  F  =  ( x  e.  A  |->  B )
Assertion
Ref Expression
elrnmpt1  |-  ( ( x  e.  A  /\  B  e.  V )  ->  B  e.  ran  F
)

Proof of Theorem elrnmpt1
Dummy variables  y 
z are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 vex 2791 . . . 4  |-  x  e. 
_V
2 id 19 . . . . . . 7  |-  ( x  =  z  ->  x  =  z )
3 csbeq1a 3089 . . . . . . 7  |-  ( x  =  z  ->  A  =  [_ z  /  x ]_ A )
42, 3eleq12d 2351 . . . . . 6  |-  ( x  =  z  ->  (
x  e.  A  <->  z  e.  [_ z  /  x ]_ A ) )
5 csbeq1a 3089 . . . . . . 7  |-  ( x  =  z  ->  B  =  [_ z  /  x ]_ B )
65biantrud 493 . . . . . 6  |-  ( x  =  z  ->  (
z  e.  [_ z  /  x ]_ A  <->  ( z  e.  [_ z  /  x ]_ A  /\  B  = 
[_ z  /  x ]_ B ) ) )
74, 6bitr2d 245 . . . . 5  |-  ( x  =  z  ->  (
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B )  <-> 
x  e.  A ) )
87eqcoms 2286 . . . 4  |-  ( z  =  x  ->  (
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B )  <-> 
x  e.  A ) )
91, 8spcev 2875 . . 3  |-  ( x  e.  A  ->  E. z
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B ) )
10 df-rex 2549 . . . . . 6  |-  ( E. x  e.  A  y  =  B  <->  E. x
( x  e.  A  /\  y  =  B
) )
11 nfv 1605 . . . . . . 7  |-  F/ z ( x  e.  A  /\  y  =  B
)
12 nfcsb1v 3113 . . . . . . . . 9  |-  F/_ x [_ z  /  x ]_ A
1312nfel2 2431 . . . . . . . 8  |-  F/ x  z  e.  [_ z  /  x ]_ A
14 nfcsb1v 3113 . . . . . . . . 9  |-  F/_ x [_ z  /  x ]_ B
1514nfeq2 2430 . . . . . . . 8  |-  F/ x  y  =  [_ z  /  x ]_ B
1613, 15nfan 1771 . . . . . . 7  |-  F/ x
( z  e.  [_ z  /  x ]_ A  /\  y  =  [_ z  /  x ]_ B )
175eqeq2d 2294 . . . . . . . 8  |-  ( x  =  z  ->  (
y  =  B  <->  y  =  [_ z  /  x ]_ B ) )
184, 17anbi12d 691 . . . . . . 7  |-  ( x  =  z  ->  (
( x  e.  A  /\  y  =  B
)  <->  ( z  e. 
[_ z  /  x ]_ A  /\  y  =  [_ z  /  x ]_ B ) ) )
1911, 16, 18cbvex 1925 . . . . . 6  |-  ( E. x ( x  e.  A  /\  y  =  B )  <->  E. z
( z  e.  [_ z  /  x ]_ A  /\  y  =  [_ z  /  x ]_ B ) )
2010, 19bitri 240 . . . . 5  |-  ( E. x  e.  A  y  =  B  <->  E. z
( z  e.  [_ z  /  x ]_ A  /\  y  =  [_ z  /  x ]_ B ) )
21 eqeq1 2289 . . . . . . 7  |-  ( y  =  B  ->  (
y  =  [_ z  /  x ]_ B  <->  B  =  [_ z  /  x ]_ B ) )
2221anbi2d 684 . . . . . 6  |-  ( y  =  B  ->  (
( z  e.  [_ z  /  x ]_ A  /\  y  =  [_ z  /  x ]_ B )  <-> 
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B ) ) )
2322exbidv 1612 . . . . 5  |-  ( y  =  B  ->  ( E. z ( z  e. 
[_ z  /  x ]_ A  /\  y  =  [_ z  /  x ]_ B )  <->  E. z
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B ) ) )
2420, 23syl5bb 248 . . . 4  |-  ( y  =  B  ->  ( E. x  e.  A  y  =  B  <->  E. z
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B ) ) )
25 rnmpt.1 . . . . 5  |-  F  =  ( x  e.  A  |->  B )
2625rnmpt 4925 . . . 4  |-  ran  F  =  { y  |  E. x  e.  A  y  =  B }
2724, 26elab2g 2916 . . 3  |-  ( B  e.  V  ->  ( B  e.  ran  F  <->  E. z
( z  e.  [_ z  /  x ]_ A  /\  B  =  [_ z  /  x ]_ B ) ) )
289, 27syl5ibr 212 . 2  |-  ( B  e.  V  ->  (
x  e.  A  ->  B  e.  ran  F ) )
2928impcom 419 1  |-  ( ( x  e.  A  /\  B  e.  V )  ->  B  e.  ran  F
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358   E.wex 1528    = wceq 1623    e. wcel 1684   E.wrex 2544   [_csb 3081    e. cmpt 4077   ran crn 4690
This theorem is referenced by:  fliftel1  5809  minveclem4  18796  minvecolem4  21459  rexunirn  23140  totbndbnd  26513  rrnequiv  26559
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pr 4214
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-rex 2549  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-sn 3646  df-pr 3647  df-op 3649  df-br 4024  df-opab 4078  df-mpt 4079  df-cnv 4697  df-dm 4699  df-rn 4700
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