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Theorem f1oi 5373
Description: A restriction of the identity relation is a one-to-one onto function. (Contributed by NM, 30-Apr-1998.) (Proof shortened by Andrew Salmon, 22-Oct-2011.)
Assertion
Ref Expression
f1oi  |-  (  _I  |`  A ) : A -1-1-onto-> A

Proof of Theorem f1oi
StepHypRef Expression
1 fnresi 5210 . 2  |-  (  _I  |`  A )  Fn  A
2 cnvresid 5167 . . . 4  |-  `' (  _I  |`  A )  =  (  _I  |`  A )
32fneq1i 5187 . . 3  |-  ( `' (  _I  |`  A )  Fn  A  <->  (  _I  |`  A )  Fn  A
)
41, 3mpbir 145 . 2  |-  `' (  _I  |`  A )  Fn  A
5 dff1o4 5343 . 2  |-  ( (  _I  |`  A ) : A -1-1-onto-> A  <->  ( (  _I  |`  A )  Fn  A  /\  `' (  _I  |`  A )  Fn  A ) )
61, 4, 5mpbir2an 911 1  |-  (  _I  |`  A ) : A -1-1-onto-> A
Colors of variables: wff set class
Syntax hints:    _I cid 4180   `'ccnv 4508    |` cres 4511    Fn wfn 5088   -1-1-onto->wf1o 5092
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 683  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-10 1468  ax-11 1469  ax-i12 1470  ax-bndl 1471  ax-4 1472  ax-14 1477  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099  ax-sep 4016  ax-pow 4068  ax-pr 4101
This theorem depends on definitions:  df-bi 116  df-3an 949  df-tru 1319  df-nf 1422  df-sb 1721  df-eu 1980  df-mo 1981  df-clab 2104  df-cleq 2110  df-clel 2113  df-nfc 2247  df-ral 2398  df-rex 2399  df-v 2662  df-un 3045  df-in 3047  df-ss 3054  df-pw 3482  df-sn 3503  df-pr 3504  df-op 3506  df-br 3900  df-opab 3960  df-id 4185  df-xp 4515  df-rel 4516  df-cnv 4517  df-co 4518  df-dm 4519  df-rn 4520  df-res 4521  df-ima 4522  df-fun 5095  df-fn 5096  df-f 5097  df-f1 5098  df-fo 5099  df-f1o 5100
This theorem is referenced by:  f1ovi  5374  isoid  5679  enrefg  6626  ssdomg  6640  omp1eomlem  6947  ctm  6962  omct  6970  ctssexmid  6992  ssidcn  12306  dvid  12758  dvexp  12771  subctctexmid  13123
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