unirnffid - Metamath Proof Explorer

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Theorem unirnffid 9305

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	1	ffnd 6692	. . . 4 ⊢ (𝜑 → 𝐹 Fn 𝑇)
3		unirnffid.2	. . . 4 ⊢ (𝜑 → 𝑇 ∈ Fin)
4		fnfi 9148	. . . 4 ⊢ ((𝐹 Fn 𝑇 ∧ 𝑇 ∈ Fin) → 𝐹 ∈ Fin)
5	2, 3, 4	syl2anc 584	. . 3 ⊢ (𝜑 → 𝐹 ∈ Fin)
6		rnfi 9298	. . 3 ⊢ (𝐹 ∈ Fin → ran 𝐹 ∈ Fin)
7	5, 6	syl 17	. 2 ⊢ (𝜑 → ran 𝐹 ∈ Fin)
8	1	frnd 6699	. 2 ⊢ (𝜑 → ran 𝐹 ⊆ Fin)
9		unifi 9302	. 2 ⊢ ((ran 𝐹 ∈ Fin ∧ ran 𝐹 ⊆ Fin) → ∪ ran 𝐹 ∈ Fin)
10	7, 8, 9	syl2anc 584	1 ⊢ (𝜑 → ∪ ran 𝐹 ∈ Fin)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∈ wcel 2109 ⊆ wss 3917 ∪ cuni 4874 ran crn 5642 Fn wfn 6509 ⟶wf 6510 Fincfn 8921

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-om 7846 df-1st 7971 df-2nd 7972 df-1o 8437 df-en 8922 df-dom 8923 df-fin 8925

This theorem is referenced by: marypha2 9397 acsinfd 18522

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