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Theorem cnvimamptfin 9237
Description: A preimage of a mapping with a finite domain under any class is finite. In contrast to fisuppfi 9255, 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 6030 . . 3 ((𝑝𝑁𝑋) “ 𝑌) ⊆ dom (𝑝𝑁𝑋)
3 eqid 2731 . . . 4 (𝑝𝑁𝑋) = (𝑝𝑁𝑋)
43dmmptss 6188 . . 3 dom (𝑝𝑁𝑋) ⊆ 𝑁
52, 4sstri 3939 . 2 ((𝑝𝑁𝑋) “ 𝑌) ⊆ 𝑁
6 ssfi 9082 . 2 ((𝑁 ∈ Fin ∧ ((𝑝𝑁𝑋) “ 𝑌) ⊆ 𝑁) → ((𝑝𝑁𝑋) “ 𝑌) ∈ Fin)
71, 5, 6sylancl 586 1 (𝜑 → ((𝑝𝑁𝑋) “ 𝑌) ∈ Fin)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2111  wss 3897  cmpt 5170  ccnv 5613  dom cdm 5614  cima 5617  Fincfn 8869
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-sep 5232  ax-nul 5242  ax-pr 5368  ax-un 7668
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-eu 2564  df-clab 2710  df-cleq 2723  df-clel 2806  df-nfc 2881  df-ne 2929  df-ral 3048  df-rex 3057  df-reu 3347  df-rab 3396  df-v 3438  df-sbc 3737  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-pss 3917  df-nul 4281  df-if 4473  df-pw 4549  df-sn 4574  df-pr 4576  df-op 4580  df-uni 4857  df-br 5090  df-opab 5152  df-mpt 5171  df-tr 5197  df-id 5509  df-eprel 5514  df-po 5522  df-so 5523  df-fr 5567  df-we 5569  df-xp 5620  df-rel 5621  df-cnv 5622  df-co 5623  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-ord 6309  df-on 6310  df-lim 6311  df-suc 6312  df-iota 6437  df-fun 6483  df-fn 6484  df-f 6485  df-f1 6486  df-fo 6487  df-f1o 6488  df-fv 6489  df-om 7797  df-1o 8385  df-en 8870  df-fin 8873
This theorem is referenced by:  elrgspnsubrunlem2  33215
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