ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  f1oi GIF version

Theorem f1oi 5619
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):𝐴1-1-onto𝐴

Proof of Theorem f1oi
StepHypRef Expression
1 fnresi 5447 . 2 ( I ↾ 𝐴) Fn 𝐴
2 cnvresid 5401 . . . 4 ( I ↾ 𝐴) = ( I ↾ 𝐴)
32fneq1i 5421 . . 3 (( I ↾ 𝐴) Fn 𝐴 ↔ ( I ↾ 𝐴) Fn 𝐴)
41, 3mpbir 146 . 2 ( I ↾ 𝐴) Fn 𝐴
5 dff1o4 5588 . 2 (( I ↾ 𝐴):𝐴1-1-onto𝐴 ↔ (( I ↾ 𝐴) Fn 𝐴( I ↾ 𝐴) Fn 𝐴))
61, 4, 5mpbir2an 948 1 ( I ↾ 𝐴):𝐴1-1-onto𝐴
Colors of variables: wff set class
Syntax hints:   I cid 4383  ccnv 4722  cres 4725   Fn wfn 5319  1-1-ontowf1o 5323
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-br 4087  df-opab 4149  df-id 4388  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-res 4735  df-ima 4736  df-fun 5326  df-fn 5327  df-f 5328  df-f1 5329  df-fo 5330  df-f1o 5331
This theorem is referenced by:  f1ovi  5620  isoid  5946  enrefg  6932  ssdomg  6947  omp1eomlem  7284  ctm  7299  omct  7307  ctssexmid  7340  ssomct  13056  idmhm  13542  idghm  13836  ssidcn  14924  dvid  15409  dvidre  15411  dvexp  15425  ausgrusgrben  16007  subctctexmid  16537
  Copyright terms: Public domain W3C validator