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Theorem cnvimamptfin 9222
Description: A preimage of a mapping with a finite domain under any class is finite. In contrast to fisuppfi 9238, the range of the mapping needs not to be known. (Contributed by AV, 21-Dec-2018.)
Hypothesis
Ref Expression
cnvimamptfin.n (𝜑𝑁 ∈ Fin)
Assertion
Ref Expression
cnvimamptfin (𝜑 → ((𝑝𝑁𝑋) “ 𝑌) ∈ Fin)
Distinct variable group:   𝑁,𝑝
Allowed substitution hints:   𝜑(𝑝)   𝑋(𝑝)   𝑌(𝑝)

Proof of Theorem cnvimamptfin
StepHypRef Expression
1 cnvimamptfin.n . 2 (𝜑𝑁 ∈ Fin)
2 cnvimass 6023 . . 3 ((𝑝𝑁𝑋) “ 𝑌) ⊆ dom (𝑝𝑁𝑋)
3 eqid 2737 . . . 4 (𝑝𝑁𝑋) = (𝑝𝑁𝑋)
43dmmptss 6183 . . 3 dom (𝑝𝑁𝑋) ⊆ 𝑁
52, 4sstri 3944 . 2 ((𝑝𝑁𝑋) “ 𝑌) ⊆ 𝑁
6 ssfi 9042 . 2 ((𝑁 ∈ Fin ∧ ((𝑝𝑁𝑋) “ 𝑌) ⊆ 𝑁) → ((𝑝𝑁𝑋) “ 𝑌) ∈ Fin)
71, 5, 6sylancl 587 1 (𝜑 → ((𝑝𝑁𝑋) “ 𝑌) ∈ Fin)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2106  wss 3901  cmpt 5179  ccnv 5623  dom cdm 5624  cima 5627  Fincfn 8808
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2708  ax-sep 5247  ax-nul 5254  ax-pr 5376  ax-un 7654
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2815  df-nfc 2887  df-ne 2942  df-ral 3063  df-rex 3072  df-reu 3351  df-rab 3405  df-v 3444  df-sbc 3731  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-pss 3920  df-nul 4274  df-if 4478  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4857  df-br 5097  df-opab 5159  df-mpt 5180  df-tr 5214  df-id 5522  df-eprel 5528  df-po 5536  df-so 5537  df-fr 5579  df-we 5581  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-ord 6309  df-on 6310  df-lim 6311  df-suc 6312  df-iota 6435  df-fun 6485  df-fn 6486  df-f 6487  df-f1 6488  df-fo 6489  df-f1o 6490  df-fv 6491  df-om 7785  df-1o 8371  df-en 8809  df-fin 8812
This theorem is referenced by: (None)
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