Theorem unirnffid 8258

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

Step	Hyp	Ref	Expression
1		unirnffid.1	. . . . 5 ⊢ (𝜑 → 𝐹:𝑇⟶Fin)
2		ffn 6045	. . . . 5 ⊢ (𝐹:𝑇⟶Fin → 𝐹 Fn 𝑇)
3	1, 2	syl 17	. . . 4 ⊢ (𝜑 → 𝐹 Fn 𝑇)
4		unirnffid.2	. . . 4 ⊢ (𝜑 → 𝑇 ∈ Fin)
5		fnfi 8238	. . . 4 ⊢ ((𝐹 Fn 𝑇 ∧ 𝑇 ∈ Fin) → 𝐹 ∈ Fin)
6	3, 4, 5	syl2anc 693	. . 3 ⊢ (𝜑 → 𝐹 ∈ Fin)
7		rnfi 8249	. . 3 ⊢ (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
8	6, 7	syl 17	. 2 ⊢ (𝜑 → ran 𝐹 ∈ Fin)
9		frn 6053	. . 3 ⊢ (𝐹:𝑇⟶Fin → ran 𝐹 ⊆ Fin)
10	1, 9	syl 17	. 2 ⊢ (𝜑 → ran 𝐹 ⊆ Fin)
11		unifi 8255	. 2 ⊢ ((ran 𝐹 ∈ Fin ∧ ran 𝐹 ⊆ Fin) → ∪ ran 𝐹 ∈ Fin)
12	8, 10, 11	syl2anc 693	1 ⊢ (𝜑 → ∪ ran 𝐹 ∈ Fin)

Syntax hints:   → wi 4   ∈ wcel 1990   ⊆ wss 3574  ∪ cuni 4436  ran crn 5115   Fn wfn 5883  ⟶wf 5884  Fincfn 7955

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-fin 7959

This theorem is referenced by:  marypha2  8345  acsinfd  17180