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Theorem unirnffid 9337
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 (𝜑 → 𝐹:𝑇⟶Fin)
unirnffid.2 (𝜑 → 𝑇 ∈ Fin)
Assertion
Ref Expression
unirnffid (𝜑 → ∪ ran 𝐹 ∈ Fin)

Proof of Theorem unirnffid
StepHypRef Expression
1 unirnffid.1 . . . . 5 (𝜑 → 𝐹:𝑇⟶Fin)
21ffnd 6710 . . . 4 (𝜑 → 𝐹 Fn 𝑇)
3 unirnffid.2 . . . 4 (𝜑 → 𝑇 ∈ Fin)
4 fnfi 9194 . . . 4 ((𝐹 Fn 𝑇 ∧ 𝑇 ∈ Fin) → 𝐹 ∈ Fin)
52, 3, 4syl2anc 596 . . 3 (𝜑 → 𝐹 ∈ Fin)
6 rnfi 9330 . . 3 (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
75, 6syl 18 . 2 (𝜑 → ran 𝐹 ∈ Fin)
81frnd 6718 . 2 (𝜑 → ran 𝐹 ⊆ Fin)
9 unifi 9334 . 2 ((ran 𝐹 ∈ Fin ∧ ran 𝐹 ⊆ Fin) → ∪ ran 𝐹 ∈ Fin)
107, 8, 9syl2anc 596 1 (𝜑 → ∪ ran 𝐹 ∈ Fin)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∈ wcel 2144   ⊆ wss 3895  ∪ cuni 4866  ran crn 5651   Fn wfn 6533  ⟶wf 6534  Fincfn 8974
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pow 5326  ax-pr 5390  ax-un 7751
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-reu 3366  df-rab 3413  df-v 3452  df-sbc 3739  df-csb 3847  df-ss 3896  df-pss 4014  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-iun 4952  df-br 5103  df-opab 5167  df-mpt 5186  df-tr 5212  df-id 5545  df-eprel 5550  df-po 5558  df-so 5559  df-fr 5603  df-we 5605  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-ord 6365  df-on 6366  df-lim 6367  df-suc 6368  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-fv 6546  df-om 7878  df-1st 8001  df-2nd 8002  df-1o 8477  df-en 8975  df-dom 8976  df-fin 8978
This theorem is used by:  marypha2  9432  acsinfd  18731
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