Theorem cnvimamptfin 9393

Description: A preimage of a mapping with a finite domain under any class is finite. In contrast to fisuppfi 9411, the range of the mapping needs not to be known. (Contributed by AV, 21-Dec-2018.)

Hypothesis

Ref	Expression
cnvimamptfin.n	⊢ (𝜑 → 𝑁 ∈ Fin)

Assertion

Ref	Expression
cnvimamptfin	⊢ (𝜑 → (◡(𝑝 ∈ 𝑁 ↦ 𝑋) “ 𝑌) ∈ Fin)

Distinct variable group:   𝑁,𝑝

Allowed substitution hints:   𝜑(𝑝)   𝑋(𝑝)   𝑌(𝑝)

Proof of Theorem cnvimamptfin

Step	Hyp	Ref	Expression
1		cnvimamptfin.n	. 2 ⊢ (𝜑 → 𝑁 ∈ Fin)
2		cnvimass 6100	. . 3 ⊢ (◡(𝑝 ∈ 𝑁 ↦ 𝑋) “ 𝑌) ⊆ dom (𝑝 ∈ 𝑁 ↦ 𝑋)
3		eqid 2737	. . . 4 ⊢ (𝑝 ∈ 𝑁 ↦ 𝑋) = (𝑝 ∈ 𝑁 ↦ 𝑋)
4	3	dmmptss 6261	. . 3 ⊢ dom (𝑝 ∈ 𝑁 ↦ 𝑋) ⊆ 𝑁
5	2, 4	sstri 3993	. 2 ⊢ (◡(𝑝 ∈ 𝑁 ↦ 𝑋) “ 𝑌) ⊆ 𝑁
6		ssfi 9213	. 2 ⊢ ((𝑁 ∈ Fin ∧ (◡(𝑝 ∈ 𝑁 ↦ 𝑋) “ 𝑌) ⊆ 𝑁) → (◡(𝑝 ∈ 𝑁 ↦ 𝑋) “ 𝑌) ∈ Fin)
7	1, 5, 6	sylancl 586	1 ⊢ (𝜑 → (◡(𝑝 ∈ 𝑁 ↦ 𝑋) “ 𝑌) ∈ Fin)

Syntax hints:   → wi 4   ∈ wcel 2108   ⊆ wss 3951   ↦ cmpt 5225  ^◡ccnv 5684  dom cdm 5685   “ cima 5688  Fincfn 8985

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2157  ax-12 2177  ax-ext 2708  ax-sep 5296  ax-nul 5306  ax-pr 5432  ax-un 7755

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2065  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3381  df-rab 3437  df-v 3482  df-sbc 3789  df-dif 3954  df-un 3956  df-in 3958  df-ss 3968  df-pss 3971  df-nul 4334  df-if 4526  df-pw 4602  df-sn 4627  df-pr 4629  df-op 4633  df-uni 4908  df-br 5144  df-opab 5206  df-mpt 5226  df-tr 5260  df-id 5578  df-eprel 5584  df-po 5592  df-so 5593  df-fr 5637  df-we 5639  df-xp 5691  df-rel 5692  df-cnv 5693  df-co 5694  df-dm 5695  df-rn 5696  df-res 5697  df-ima 5698  df-ord 6387  df-on 6388  df-lim 6389  df-suc 6390  df-iota 6514  df-fun 6563  df-fn 6564  df-f 6565  df-f1 6566  df-fo 6567  df-f1o 6568  df-fv 6569  df-om 7888  df-1o 8506  df-en 8986  df-fin 8989

This theorem is referenced by:  elrgspnsubrunlem2  33252