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Theorem f1ovi 5657
Description: The identity relation is a one-to-one onto function on the universe. (Contributed by NM, 16-May-2004.)
Assertion
Ref Expression
f1ovi  |-  _I  : _V
-1-1-onto-> _V

Proof of Theorem f1ovi
StepHypRef Expression
1 f1oi 5656 . 2  |-  (  _I  |`  _V ) : _V -1-1-onto-> _V
2 reli 4886 . . . 4  |-  Rel  _I
3 dfrel3 5222 . . . 4  |-  ( Rel 
_I 
<->  (  _I  |`  _V )  =  _I  )
42, 3mpbi 145 . . 3  |-  (  _I  |`  _V )  =  _I
5 f1oeq1 5604 . . 3  |-  ( (  _I  |`  _V )  =  _I  ->  ( (  _I  |`  _V ) : _V -1-1-onto-> _V  <->  _I  : _V -1-1-onto-> _V ) )
64, 5ax-mp 5 . 2  |-  ( (  _I  |`  _V ) : _V -1-1-onto-> _V  <->  _I  : _V -1-1-onto-> _V )
71, 6mpbi 145 1  |-  _I  : _V
-1-1-onto-> _V
Colors of variables: wff set class
Syntax hints:    <-> wb 105    = wceq 1398   _Vcvv 2815    _I cid 4411    |` cres 4753   Rel wrel 4756   -1-1-onto->wf1o 5353
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 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-br 4112  df-opab 4174  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361
This theorem is referenced by:  residfi  7209
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