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Theorem imaf1fi 7124
Description: The image of a finite set under a one-to-one mapping is finite. (Contributed by Jim Kingdon, 28-Mar-2026.)
Assertion
Ref Expression
imaf1fi  |-  ( ( F : A -1-1-> B  /\  X  C_  A  /\  X  e.  Fin )  ->  ( F " X
)  e.  Fin )

Proof of Theorem imaf1fi
StepHypRef Expression
1 simp3 1025 . 2  |-  ( ( F : A -1-1-> B  /\  X  C_  A  /\  X  e.  Fin )  ->  X  e.  Fin )
2 f1imaeng 6965 . 2  |-  ( ( F : A -1-1-> B  /\  X  C_  A  /\  X  e.  Fin )  ->  ( F " X
)  ~~  X )
3 enfii 7060 . 2  |-  ( ( X  e.  Fin  /\  ( F " X ) 
~~  X )  -> 
( F " X
)  e.  Fin )
41, 2, 3syl2anc 411 1  |-  ( ( F : A -1-1-> B  /\  X  C_  A  /\  X  e.  Fin )  ->  ( F " X
)  e.  Fin )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 1004    e. wcel 2202    C_ wss 3200   class class class wbr 4088   "cima 4728   -1-1->wf1 5323    ~~ cen 6906   Fincfn 6908
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-er 6701  df-en 6909  df-fin 6911
This theorem is referenced by:  trlsegvdeglem6  16315
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