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Theorem inresflem 7126
Description: Lemma for inlresf1 7127 and inrresf1 7128. (Contributed by BJ, 4-Jul-2022.)
Hypotheses
Ref Expression
inresflem.1  |-  F : A
-1-1-onto-> ( { X }  X.  A )
inresflem.2  |-  ( x  e.  A  ->  ( F `  x )  e.  B )
Assertion
Ref Expression
inresflem  |-  F : A -1-1-> B
Distinct variable groups:    x, A    x, B    x, F
Allowed substitution hint:    X( x)

Proof of Theorem inresflem
StepHypRef Expression
1 inresflem.1 . . 3  |-  F : A
-1-1-onto-> ( { X }  X.  A )
2 f1of1 5503 . . 3  |-  ( F : A -1-1-onto-> ( { X }  X.  A )  ->  F : A -1-1-> ( { X }  X.  A ) )
31, 2ax-mp 5 . 2  |-  F : A -1-1-> ( { X }  X.  A )
4 f1ofn 5505 . . . 4  |-  ( F : A -1-1-onto-> ( { X }  X.  A )  ->  F  Fn  A )
51, 4ax-mp 5 . . 3  |-  F  Fn  A
6 inresflem.2 . . . . 5  |-  ( x  e.  A  ->  ( F `  x )  e.  B )
76rgen 2550 . . . 4  |-  A. x  e.  A  ( F `  x )  e.  B
8 fnfvrnss 5722 . . . 4  |-  ( ( F  Fn  A  /\  A. x  e.  A  ( F `  x )  e.  B )  ->  ran  F  C_  B )
95, 7, 8mp2an 426 . . 3  |-  ran  F  C_  B
10 df-f 5262 . . 3  |-  ( F : A --> B  <->  ( F  Fn  A  /\  ran  F  C_  B ) )
115, 9, 10mpbir2an 944 . 2  |-  F : A
--> B
12 f1ff1 5471 . 2  |-  ( ( F : A -1-1-> ( { X }  X.  A )  /\  F : A --> B )  ->  F : A -1-1-> B )
133, 11, 12mp2an 426 1  |-  F : A -1-1-> B
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2167   A.wral 2475    C_ wss 3157   {csn 3622    X. cxp 4661   ran crn 4664    Fn wfn 5253   -->wf 5254   -1-1->wf1 5255   -1-1-onto->wf1o 5257   ` cfv 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-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-sbc 2990  df-un 3161  df-in 3163  df-ss 3170  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-opab 4095  df-mpt 4096  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-rn 4674  df-iota 5219  df-fun 5260  df-fn 5261  df-f 5262  df-f1 5263  df-f1o 5265  df-fv 5266
This theorem is referenced by:  inlresf1  7127  inrresf1  7128
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