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Theorem unirnffid 8202
 Description: The union of the range of a function from a finite set into the class of finite sets is finite. Deduction form. (Contributed by David Moews, 1-May-2017.)
Hypotheses
Ref Expression
unirnffid.1 (𝜑𝐹:𝑇⟶Fin)
unirnffid.2 (𝜑𝑇 ∈ Fin)
Assertion
Ref Expression
unirnffid (𝜑 ran 𝐹 ∈ Fin)

Proof of Theorem unirnffid
StepHypRef Expression
1 unirnffid.1 . . . . 5 (𝜑𝐹:𝑇⟶Fin)
2 ffn 6002 . . . . 5 (𝐹:𝑇⟶Fin → 𝐹 Fn 𝑇)
31, 2syl 17 . . . 4 (𝜑𝐹 Fn 𝑇)
4 unirnffid.2 . . . 4 (𝜑𝑇 ∈ Fin)
5 fnfi 8182 . . . 4 ((𝐹 Fn 𝑇𝑇 ∈ Fin) → 𝐹 ∈ Fin)
63, 4, 5syl2anc 692 . . 3 (𝜑𝐹 ∈ Fin)
7 rnfi 8193 . . 3 (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
86, 7syl 17 . 2 (𝜑 → ran 𝐹 ∈ Fin)
9 frn 6010 . . 3 (𝐹:𝑇⟶Fin → ran 𝐹 ⊆ Fin)
101, 9syl 17 . 2 (𝜑 → ran 𝐹 ⊆ Fin)
11 unifi 8199 . 2 ((ran 𝐹 ∈ Fin ∧ ran 𝐹 ⊆ Fin) → ran 𝐹 ∈ Fin)
128, 10, 11syl2anc 692 1 (𝜑 ran 𝐹 ∈ Fin)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∈ wcel 1987   ⊆ wss 3555  ∪ cuni 4402  ran crn 5075   Fn wfn 5842  ⟶wf 5843  Fincfn 7899 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-oadd 7509  df-er 7687  df-en 7900  df-dom 7901  df-fin 7903 This theorem is referenced by:  marypha2  8289  acsinfd  17101
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