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Theorem dff1o3 5292
 Description: Alternate definition of one-to-one onto function. (The proof was shortened by Andrew Salmon, 22-Oct-2011.) (Contributed by set.mm contributors, 25-Mar-1998.) (Revised by set.mm contributors, 22-Oct-2011.)
Assertion
Ref Expression
dff1o3

Proof of Theorem dff1o3
StepHypRef Expression
1 df-3an 936 . . 3
2 an32 773 . . 3
31, 2bitri 240 . 2
4 dff1o2 5291 . 2
5 df-fo 4793 . . 3
65anbi1i 676 . 2
73, 4, 63bitr4i 268 1
 Colors of variables: wff setvar class Syntax hints:   wb 176   wa 358   w3a 934   wceq 1642  ccnv 4771   crn 4773   wfun 4775   wfn 4776  wfo 4779  wf1o 4780 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259  df-f 4791  df-f1 4792  df-fo 4793  df-f1o 4794 This theorem is referenced by:  f1ofo  5293  f1ores  5300  resdif  5306  f11o  5315
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