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Theorem f1oeq3 5495
Description: Equality theorem for one-to-one onto functions. (Contributed by NM, 10-Feb-1997.)
Assertion
Ref Expression
f1oeq3  |-  ( A  =  B  ->  ( F : C -1-1-onto-> A  <->  F : C -1-1-onto-> B ) )

Proof of Theorem f1oeq3
StepHypRef Expression
1 f1eq3 5461 . . 3  |-  ( A  =  B  ->  ( F : C -1-1-> A  <->  F : C -1-1-> B ) )
2 foeq3 5479 . . 3  |-  ( A  =  B  ->  ( F : C -onto-> A  <->  F : C -onto-> B ) )
31, 2anbi12d 473 . 2  |-  ( A  =  B  ->  (
( F : C -1-1-> A  /\  F : C -onto-> A )  <->  ( F : C -1-1-> B  /\  F : C -onto-> B ) ) )
4 df-f1o 5266 . 2  |-  ( F : C -1-1-onto-> A  <->  ( F : C -1-1-> A  /\  F : C -onto-> A ) )
5 df-f1o 5266 . 2  |-  ( F : C -1-1-onto-> B  <->  ( F : C -1-1-> B  /\  F : C -onto-> B ) )
63, 4, 53bitr4g 223 1  |-  ( A  =  B  ->  ( F : C -1-1-onto-> A  <->  F : C -1-1-onto-> B ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1364   -1-1->wf1 5256   -onto->wfo 5257   -1-1-onto->wf1o 5258
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-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-11 1520  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178
This theorem depends on definitions:  df-bi 117  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-in 3163  df-ss 3170  df-f 5263  df-f1 5264  df-fo 5265  df-f1o 5266
This theorem is referenced by:  f1oeq23  5496  f1oeq123d  5499  f1oeq3d  5502  f1ores  5520  resdif  5527  f1osng  5546  f1oresrab  5728  isoeq5  5853  isoini2  5867  mapsnf1o  6797  bren  6807  xpcomf1o  6885  frechashgf1o  10522  sumeq1  11522  fisumss  11559  fsumcnv  11604  prodeq1f  11719  4sqlem11  12580  ennnfonelemhf1o  12640  ennnfonelemex  12641  ssnnctlemct  12673
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