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Theorem resfifsupp 9360

Description: The restriction of a function to a finite set is finitely supported. (Contributed by AV, 12-Dec-2019.)

**Hypotheses**
Ref	Expression
resfifsupp.f	⊢ (𝜑 → Fun 𝐹)
resfifsupp.x	⊢ (𝜑 → 𝑋 ∈ Fin)
resfifsupp.z	⊢ (𝜑 → 𝑍 ∈ 𝑉)

**Assertion**
Ref	Expression
resfifsupp	⊢ (𝜑 → (𝐹 ↾ 𝑋) finSupp 𝑍)

**Proof of Theorem resfifsupp**
Step	Hyp	Ref	Expression
1		resindm 6031	. 2 ⊢ (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹 ↾ 𝑋)
2		resfifsupp.f	. . . . 5 ⊢ (𝜑 → Fun 𝐹)
3	2	funfnd 6571	. . . 4 ⊢ (𝜑 → 𝐹 Fn dom 𝐹)
4		fnresin2 6665	. . . 4 ⊢ (𝐹 Fn dom 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹))
5	3, 4	syl 18	. . 3 ⊢ (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹))
6		resfifsupp.x	. . . 4 ⊢ (𝜑 → 𝑋 ∈ Fin)
7		infi 9233	. . . 4 ⊢ (𝑋 ∈ Fin → (𝑋 ∩ dom 𝐹) ∈ Fin)
8	6, 7	syl 18	. . 3 ⊢ (𝜑 → (𝑋 ∩ dom 𝐹) ∈ Fin)
9		resfifsupp.z	. . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑉)
10	5, 8, 9	fndmfifsupp 9341	. 2 ⊢ (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) finSupp 𝑍)
11	1, 10	eqbrtrrid 5149	1 ⊢ (𝜑 → (𝐹 ↾ 𝑋) finSupp 𝑍)

Colors of variables: wff setvar class

This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 ∩ cin 3905 class class class wbr 5111 dom cdm 5663 ↾ cres 5665 Fun wfun 6534 Fn wfn 6535 Fincfn 8945 finSupp cfsupp 9324

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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pr 5406 ax-un 7738

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 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7865 df-supp 8159 df-1o 8455 df-en 8946 df-fin 8949 df-fsupp 9325

This theorem is used by: xrge0tsmsd 33416 ply1degltdimlem 34035

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