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Theorem unirnffid 9303
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)
21ffnd 6706 . . . 4 (𝜑𝐹 Fn 𝑇)
3 unirnffid.2 . . . 4 (𝜑𝑇 ∈ Fin)
4 fnfi 9161 . . . 4 ((𝐹 Fn 𝑇𝑇 ∈ Fin) → 𝐹 ∈ Fin)
52, 3, 4syl2anc 595 . . 3 (𝜑𝐹 ∈ Fin)
6 rnfi 9296 . . 3 (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
75, 6syl 18 . 2 (𝜑 → ran 𝐹 ∈ Fin)
81frnd 6714 . 2 (𝜑 → ran 𝐹 ⊆ Fin)
9 unifi 9300 . 2 ((ran 𝐹 ∈ Fin ∧ ran 𝐹 ⊆ Fin) → ran 𝐹 ∈ Fin)
107, 8, 9syl2anc 595 1 (𝜑 ran 𝐹 ∈ Fin)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2141  wss 3904   cuni 4871  ran crn 5662   Fn wfn 6531  wf 6532  Fincfn 8942
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5256  ax-nul 5268  ax-pow 5336  ax-pr 5404  ax-un 7732
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-nf 1812  df-sb 2095  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-reu 3368  df-rab 3415  df-v 3455  df-sbc 3744  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-pss 3924  df-nul 4286  df-if 4487  df-pw 4563  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-iun 4957  df-br 5109  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5556  df-eprel 5561  df-po 5569  df-so 5570  df-fr 5614  df-we 5616  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-ord 6363  df-on 6364  df-lim 6365  df-suc 6366  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-fv 6544  df-om 7862  df-1st 7985  df-2nd 7986  df-1o 8452  df-en 8943  df-dom 8944  df-fin 8946
This theorem is referenced by:  marypha2  9398  acsinfd  18611
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