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Theorem mptfvex 5741
Description: Sufficient condition for a maps-to notation to be set-like. (Contributed by Mario Carneiro, 3-Jul-2019.)
Hypothesis
Ref Expression
fvmpt2.1  |-  F  =  ( x  e.  A  |->  B )
Assertion
Ref Expression
mptfvex  |-  ( ( A. x  B  e.  V  /\  C  e.  W )  ->  ( F `  C )  e.  _V )
Distinct variable groups:    x, A    x, C
Allowed substitution hints:    B( x)    F( x)    V( x)    W( x)

Proof of Theorem mptfvex
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 csbeq1 3131 . . 3  |-  ( y  =  C  ->  [_ y  /  x ]_ B  = 
[_ C  /  x ]_ B )
2 fvmpt2.1 . . . 4  |-  F  =  ( x  e.  A  |->  B )
3 nfcv 2375 . . . . 5  |-  F/_ y B
4 nfcsb1v 3161 . . . . 5  |-  F/_ x [_ y  /  x ]_ B
5 csbeq1a 3137 . . . . 5  |-  ( x  =  y  ->  B  =  [_ y  /  x ]_ B )
63, 4, 5cbvmpt 4189 . . . 4  |-  ( x  e.  A  |->  B )  =  ( y  e.  A  |->  [_ y  /  x ]_ B )
72, 6eqtri 2252 . . 3  |-  F  =  ( y  e.  A  |-> 
[_ y  /  x ]_ B )
81, 7fvmptss2 5730 . 2  |-  ( F `
 C )  C_  [_ C  /  x ]_ B
9 elex 2815 . . . . . 6  |-  ( B  e.  V  ->  B  e.  _V )
109alimi 1504 . . . . 5  |-  ( A. x  B  e.  V  ->  A. x  B  e. 
_V )
113nfel1 2386 . . . . . 6  |-  F/ y  B  e.  _V
124nfel1 2386 . . . . . 6  |-  F/ x [_ y  /  x ]_ B  e.  _V
135eleq1d 2300 . . . . . 6  |-  ( x  =  y  ->  ( B  e.  _V  <->  [_ y  /  x ]_ B  e.  _V ) )
1411, 12, 13cbval 1802 . . . . 5  |-  ( A. x  B  e.  _V  <->  A. y [_ y  /  x ]_ B  e.  _V )
1510, 14sylib 122 . . . 4  |-  ( A. x  B  e.  V  ->  A. y [_ y  /  x ]_ B  e. 
_V )
161eleq1d 2300 . . . . 5  |-  ( y  =  C  ->  ( [_ y  /  x ]_ B  e.  _V  <->  [_ C  /  x ]_ B  e.  _V )
)
1716spcgv 2894 . . . 4  |-  ( C  e.  W  ->  ( A. y [_ y  /  x ]_ B  e.  _V  ->  [_ C  /  x ]_ B  e.  _V ) )
1815, 17syl5 32 . . 3  |-  ( C  e.  W  ->  ( A. x  B  e.  V  ->  [_ C  /  x ]_ B  e.  _V ) )
1918impcom 125 . 2  |-  ( ( A. x  B  e.  V  /\  C  e.  W )  ->  [_ C  /  x ]_ B  e. 
_V )
20 ssexg 4233 . 2  |-  ( ( ( F `  C
)  C_  [_ C  /  x ]_ B  /\  [_ C  /  x ]_ B  e. 
_V )  ->  ( F `  C )  e.  _V )
218, 19, 20sylancr 414 1  |-  ( ( A. x  B  e.  V  /\  C  e.  W )  ->  ( F `  C )  e.  _V )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104   A.wal 1396    = wceq 1398    e. wcel 2202   _Vcvv 2803   [_csb 3128    C_ wss 3201    |-> cmpt 4155   ` cfv 5333
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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-sbc 3033  df-csb 3129  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-iota 5293  df-fun 5335  df-fv 5341
This theorem is referenced by:  mpofvex  6379  xpcomco  7053  lssex  14433  mopnset  14631  metuex  14634
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