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Theorem unirnffid 9364
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 6732 . . . 4 (𝜑 → 𝐹 Fn 𝑇)
3 unirnffid.2 . . . 4 (𝜑 → 𝑇 ∈ Fin)
4 fnfi 9221 . . . 4 ((𝐹 Fn 𝑇 ∧ 𝑇 ∈ Fin) → 𝐹 ∈ Fin)
52, 3, 4syl2anc 596 . . 3 (𝜑 → 𝐹 ∈ Fin)
6 rnfi 9357 . . 3 (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
75, 6syl 18 . 2 (𝜑 → ran 𝐹 ∈ Fin)
81frnd 6740 . 2 (𝜑 → ran 𝐹 ⊆ Fin)
9 unifi 9361 . 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 2147   ⊆ wss 3900  ∪ cuni 4870  ran crn 5656   Fn wfn 6553  ⟶wf 6554  Fincfn 9001
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7775
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-iun 4956  df-br 5107  df-opab 5171  df-mpt 5190  df-tr 5216  df-id 5550  df-eprel 5555  df-po 5563  df-so 5564  df-fr 5608  df-we 5610  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-ord 6383  df-on 6384  df-lim 6385  df-suc 6386  df-iota 6512  df-fun 6560  df-fn 6561  df-f 6562  df-f1 6563  df-fo 6564  df-f1o 6565  df-fv 6566  df-om 7902  df-1st 8025  df-2nd 8026  df-1o 8504  df-en 9002  df-dom 9003  df-fin 9005
This theorem is used by:  marypha2  9458  acsinfd  18759
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