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Mirrors > Home > MPE Home > Th. List > resfifsupp | Structured version Visualization version GIF version |
Description: The restriction of a function to a finite set is finitely supported. (Contributed by AV, 12-Dec-2019.) |
Ref | Expression |
---|---|
resfifsupp.f | ⊢ (𝜑 → Fun 𝐹) |
resfifsupp.x | ⊢ (𝜑 → 𝑋 ∈ Fin) |
resfifsupp.z | ⊢ (𝜑 → 𝑍 ∈ 𝑉) |
Ref | Expression |
---|---|
resfifsupp | ⊢ (𝜑 → (𝐹 ↾ 𝑋) finSupp 𝑍) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resfifsupp.f | . . . 4 ⊢ (𝜑 → Fun 𝐹) | |
2 | funrel 6365 | . . . 4 ⊢ (Fun 𝐹 → Rel 𝐹) | |
3 | 1, 2 | syl 17 | . . 3 ⊢ (𝜑 → Rel 𝐹) |
4 | resindm 5893 | . . 3 ⊢ (Rel 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹 ↾ 𝑋)) | |
5 | 3, 4 | syl 17 | . 2 ⊢ (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) = (𝐹 ↾ 𝑋)) |
6 | 1 | funfnd 6379 | . . . 4 ⊢ (𝜑 → 𝐹 Fn dom 𝐹) |
7 | fnresin2 6466 | . . . 4 ⊢ (𝐹 Fn dom 𝐹 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹)) | |
8 | 6, 7 | syl 17 | . . 3 ⊢ (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) Fn (𝑋 ∩ dom 𝐹)) |
9 | resfifsupp.x | . . . 4 ⊢ (𝜑 → 𝑋 ∈ Fin) | |
10 | infi 8735 | . . . 4 ⊢ (𝑋 ∈ Fin → (𝑋 ∩ dom 𝐹) ∈ Fin) | |
11 | 9, 10 | syl 17 | . . 3 ⊢ (𝜑 → (𝑋 ∩ dom 𝐹) ∈ Fin) |
12 | resfifsupp.z | . . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑉) | |
13 | 8, 11, 12 | fndmfifsupp 8839 | . 2 ⊢ (𝜑 → (𝐹 ↾ (𝑋 ∩ dom 𝐹)) finSupp 𝑍) |
14 | 5, 13 | eqbrtrrd 5083 | 1 ⊢ (𝜑 → (𝐹 ↾ 𝑋) finSupp 𝑍) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1536 ∈ wcel 2113 ∩ cin 3928 class class class wbr 5059 dom cdm 5548 ↾ cres 5550 Rel wrel 5553 Fun wfun 6342 Fn wfn 6343 Fincfn 8502 finSupp cfsupp 8826 |
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 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-rep 5183 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5323 ax-un 7454 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1083 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-ral 3142 df-rex 3143 df-reu 3144 df-rab 3146 df-v 3493 df-sbc 3769 df-csb 3877 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-pss 3947 df-nul 4285 df-if 4461 df-pw 4534 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-tr 5166 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-ov 7152 df-oprab 7153 df-mpo 7154 df-om 7574 df-supp 7824 df-er 8282 df-en 8503 df-fin 8506 df-fsupp 8827 |
This theorem is referenced by: xrge0tsmsd 30713 |
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