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Theorem fifo 7201
Description: Describe a surjection from nonempty finite sets to finite intersections. (Contributed by Mario Carneiro, 18-May-2015.)
Hypothesis
Ref Expression
fifo.1  |-  F  =  ( y  e.  ( ( ~P A  i^i  Fin )  \  { (/) } )  |->  |^| y )
Assertion
Ref Expression
fifo  |-  ( A  e.  V  ->  F : ( ( ~P A  i^i  Fin )  \  { (/) } ) -onto-> ( fi `  A ) )
Distinct variable groups:    y, A    y, V
Allowed substitution hint:    F( y)

Proof of Theorem fifo
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 eldifsni 3763 . . . . . 6  |-  ( y  e.  ( ( ~P A  i^i  Fin )  \  { (/) } )  -> 
y  =/=  (/) )
2 intex 4183 . . . . . 6  |-  ( y  =/=  (/)  <->  |^| y  e.  _V )
31, 2sylib 188 . . . . 5  |-  ( y  e.  ( ( ~P A  i^i  Fin )  \  { (/) } )  ->  |^| y  e.  _V )
43rgen 2621 . . . 4  |-  A. y  e.  ( ( ~P A  i^i  Fin )  \  { (/)
} ) |^| y  e.  _V
5 fifo.1 . . . . 5  |-  F  =  ( y  e.  ( ( ~P A  i^i  Fin )  \  { (/) } )  |->  |^| y )
65fnmpt 5386 . . . 4  |-  ( A. y  e.  ( ( ~P A  i^i  Fin )  \  { (/) } ) |^| y  e.  _V  ->  F  Fn  ( ( ~P A  i^i  Fin )  \  { (/) } ) )
74, 6mp1i 11 . . 3  |-  ( A  e.  V  ->  F  Fn  ( ( ~P A  i^i  Fin )  \  { (/)
} ) )
8 dffn4 5473 . . 3  |-  ( F  Fn  ( ( ~P A  i^i  Fin )  \  { (/) } )  <->  F :
( ( ~P A  i^i  Fin )  \  { (/)
} ) -onto-> ran  F
)
97, 8sylib 188 . 2  |-  ( A  e.  V  ->  F : ( ( ~P A  i^i  Fin )  \  { (/) } ) -onto-> ran 
F )
10 elfi2 7184 . . . . 5  |-  ( A  e.  V  ->  (
x  e.  ( fi
`  A )  <->  E. y  e.  ( ( ~P A  i^i  Fin )  \  { (/)
} ) x  = 
|^| y ) )
11 vex 2804 . . . . . 6  |-  x  e. 
_V
125elrnmpt 4942 . . . . . 6  |-  ( x  e.  _V  ->  (
x  e.  ran  F  <->  E. y  e.  ( ( ~P A  i^i  Fin )  \  { (/) } ) x  =  |^| y
) )
1311, 12ax-mp 8 . . . . 5  |-  ( x  e.  ran  F  <->  E. y  e.  ( ( ~P A  i^i  Fin )  \  { (/)
} ) x  = 
|^| y )
1410, 13syl6bbr 254 . . . 4  |-  ( A  e.  V  ->  (
x  e.  ( fi
`  A )  <->  x  e.  ran  F ) )
1514eqrdv 2294 . . 3  |-  ( A  e.  V  ->  ( fi `  A )  =  ran  F )
16 foeq3 5465 . . 3  |-  ( ( fi `  A )  =  ran  F  -> 
( F : ( ( ~P A  i^i  Fin )  \  { (/) } ) -onto-> ( fi `  A )  <->  F :
( ( ~P A  i^i  Fin )  \  { (/)
} ) -onto-> ran  F
) )
1715, 16syl 15 . 2  |-  ( A  e.  V  ->  ( F : ( ( ~P A  i^i  Fin )  \  { (/) } ) -onto-> ( fi `  A )  <-> 
F : ( ( ~P A  i^i  Fin )  \  { (/) } )
-onto->
ran  F ) )
189, 17mpbird 223 1  |-  ( A  e.  V  ->  F : ( ( ~P A  i^i  Fin )  \  { (/) } ) -onto-> ( fi `  A ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    = wceq 1632    e. wcel 1696    =/= wne 2459   A.wral 2556   E.wrex 2557   _Vcvv 2801    \ cdif 3162    i^i cin 3164   (/)c0 3468   ~Pcpw 3638   {csn 3653   |^|cint 3878    e. cmpt 4093   ran crn 4706    Fn wfn 5266   -onto->wfo 5269   ` cfv 5271   Fincfn 6879   ficfi 7180
This theorem is referenced by:  inffien  7706  fictb  7887
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-ral 2561  df-rex 2562  df-rab 2565  df-v 2803  df-sbc 3005  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-int 3879  df-br 4040  df-opab 4094  df-mpt 4095  df-id 4325  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-iota 5235  df-fun 5273  df-fn 5274  df-fo 5277  df-fv 5279  df-fi 7181
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