MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  dff1o5 Unicode version

Theorem dff1o5 5481
Description: Alternate definition of one-to-one onto function. (Contributed by NM, 10-Dec-2003.) (Proof shortened by Andrew Salmon, 22-Oct-2011.)
Assertion
Ref Expression
dff1o5  |-  ( F : A -1-1-onto-> B  <->  ( F : A -1-1-> B  /\  ran  F  =  B ) )

Proof of Theorem dff1o5
StepHypRef Expression
1 df-f1o 5262 . 2  |-  ( F : A -1-1-onto-> B  <->  ( F : A -1-1-> B  /\  F : A -onto-> B ) )
2 f1f 5437 . . . . 5  |-  ( F : A -1-1-> B  ->  F : A --> B )
32biantrurd 494 . . . 4  |-  ( F : A -1-1-> B  -> 
( ran  F  =  B 
<->  ( F : A --> B  /\  ran  F  =  B ) ) )
4 dffo2 5455 . . . 4  |-  ( F : A -onto-> B  <->  ( F : A --> B  /\  ran  F  =  B ) )
53, 4syl6rbbr 255 . . 3  |-  ( F : A -1-1-> B  -> 
( F : A -onto-> B 
<->  ran  F  =  B ) )
65pm5.32i 618 . 2  |-  ( ( F : A -1-1-> B  /\  F : A -onto-> B
)  <->  ( F : A -1-1-> B  /\  ran  F  =  B ) )
71, 6bitri 240 1  |-  ( F : A -1-1-onto-> B  <->  ( F : A -1-1-> B  /\  ran  F  =  B ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 176    /\ wa 358    = wceq 1623   ran crn 4690   -->wf 5251   -1-1->wf1 5252   -onto->wfo 5253   -1-1-onto->wf1o 5254
This theorem is referenced by:  f1orescnv  5488  domdifsn  6945  sucdom2  7057  ackbij1  7864  ackbij2  7869  fin4en1  7935  om2uzf1oi  11016  pwssplit4  27191  indlcim  27310  s4f1o  28093  cdleme50f1o  30735  diaf1oN  31320
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264
This theorem depends on definitions:  df-bi 177  df-an 360  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-clab 2270  df-cleq 2276  df-clel 2279  df-in 3159  df-ss 3166  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262
  Copyright terms: Public domain W3C validator