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Theorem funrnfi 7003
Description: The range of a finite relation is finite if its converse is a function. (Contributed by Jim Kingdon, 5-Feb-2022.)
Assertion
Ref Expression
funrnfi  |-  ( ( Rel  A  /\  Fun  `' A  /\  A  e. 
Fin )  ->  ran  A  e.  Fin )

Proof of Theorem funrnfi
StepHypRef Expression
1 df-rn 4671 . 2  |-  ran  A  =  dom  `' A
2 relcnvfi 7002 . . . 4  |-  ( ( Rel  A  /\  A  e.  Fin )  ->  `' A  e.  Fin )
323adant2 1018 . . 3  |-  ( ( Rel  A  /\  Fun  `' A  /\  A  e. 
Fin )  ->  `' A  e.  Fin )
4 simp2 1000 . . 3  |-  ( ( Rel  A  /\  Fun  `' A  /\  A  e. 
Fin )  ->  Fun  `' A )
5 fundmfi 6998 . . 3  |-  ( ( `' A  e.  Fin  /\ 
Fun  `' A )  ->  dom  `' A  e.  Fin )
63, 4, 5syl2anc 411 . 2  |-  ( ( Rel  A  /\  Fun  `' A  /\  A  e. 
Fin )  ->  dom  `' A  e.  Fin )
71, 6eqeltrid 2280 1  |-  ( ( Rel  A  /\  Fun  `' A  /\  A  e. 
Fin )  ->  ran  A  e.  Fin )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 980    e. wcel 2164   `'ccnv 4659   dom cdm 4660   ran crn 4661   Rel wrel 4665   Fun wfun 5249   Fincfn 6796
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 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4148  ax-pow 4204  ax-pr 4239  ax-un 4465
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-v 2762  df-sbc 2987  df-un 3158  df-in 3160  df-ss 3167  df-pw 3604  df-sn 3625  df-pr 3626  df-op 3628  df-uni 3837  df-int 3872  df-br 4031  df-opab 4092  df-mpt 4093  df-id 4325  df-xp 4666  df-rel 4667  df-cnv 4668  df-co 4669  df-dm 4670  df-rn 4671  df-res 4672  df-ima 4673  df-iota 5216  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-1st 6195  df-2nd 6196  df-er 6589  df-en 6797  df-fin 6799
This theorem is referenced by:  f1dmvrnfibi  7005  4sqlemffi  12537
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