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Theorem f1oi 5682
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 5504 . 2  |-  (  _I  |`  A )  Fn  A
2 cnvresid 5458 . . . 4  |-  `' (  _I  |`  A )  =  (  _I  |`  A )
32fneq1i 5478 . . 3  |-  ( `' (  _I  |`  A )  Fn  A  <->  (  _I  |`  A )  Fn  A
)
41, 3mpbir 146 . 2  |-  `' (  _I  |`  A )  Fn  A
5 dff1o4 5650 . 2  |-  ( (  _I  |`  A ) : A -1-1-onto-> A  <->  ( (  _I  |`  A )  Fn  A  /\  `' (  _I  |`  A )  Fn  A ) )
61, 4, 5mpbir2an 955 1  |-  (  _I  |`  A ) : A -1-1-onto-> A
Colors of variables:    wff set class
This proof depends on syntax axioms:    _I cid 4435   `'ccnv 4775    |` cres 4778    Fn wfn 5375   -1-1-onto->wf1o 5379
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-br 4132  df-opab 4194  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789  df-fun 5382  df-fn 5383  df-f 5384  df-f1 5385  df-fo 5386  df-f1o 5387
This theorem is used by:  f1ovi  5683  isoid  6019  enrefg  7054  ssdomg  7069  omp1eomlem  7440  ctm  7455  omct  7463  ctssexmid  7496  ssomct  13394  idmhm  13835  idghm  14121  gzsumgsum1  14243  ssidcn  15436  dvid  15921  dvidre  15923  dvexp  15937  ausgrusgrben  16614  subctctexmid  17235
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