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| Mirrors > Home > MPE Home > Th. List > resfsupp | Structured version Visualization version GIF version | ||
| Description: If the restriction of a function by a set which, subtracted from the domain of the function so that its difference is finitely supported, the function itself is finitely supported. (Contributed by AV, 27-May-2019.) |
| Ref | Expression |
|---|---|
| resfsupp.b | ⊢ (𝜑 → (dom 𝐹 ∖ 𝐵) ∈ Fin) |
| resfsupp.e | ⊢ (𝜑 → 𝐹 ∈ 𝑊) |
| resfsupp.f | ⊢ (𝜑 → Fun 𝐹) |
| resfsupp.g | ⊢ (𝜑 → 𝐺 = (𝐹 ↾ 𝐵)) |
| resfsupp.s | ⊢ (𝜑 → 𝐺 finSupp 𝑍) |
| resfsupp.z | ⊢ (𝜑 → 𝑍 ∈ 𝑉) |
| Ref | Expression |
|---|---|
| resfsupp | ⊢ (𝜑 → 𝐹 finSupp 𝑍) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | resfsupp.b | . . 3 ⊢ (𝜑 → (dom 𝐹 ∖ 𝐵) ∈ Fin) | |
| 2 | resfsupp.e | . . 3 ⊢ (𝜑 → 𝐹 ∈ 𝑊) | |
| 3 | resfsupp.g | . . 3 ⊢ (𝜑 → 𝐺 = (𝐹 ↾ 𝐵)) | |
| 4 | resfsupp.s | . . . 4 ⊢ (𝜑 → 𝐺 finSupp 𝑍) | |
| 5 | 4 | fsuppimpd 9327 | . . 3 ⊢ (𝜑 → (𝐺 supp 𝑍) ∈ Fin) |
| 6 | resfsupp.z | . . 3 ⊢ (𝜑 → 𝑍 ∈ 𝑉) | |
| 7 | 1, 2, 3, 5, 6 | ressuppfi 9353 | . 2 ⊢ (𝜑 → (𝐹 supp 𝑍) ∈ Fin) |
| 8 | resfsupp.f | . . 3 ⊢ (𝜑 → Fun 𝐹) | |
| 9 | funisfsupp 9325 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐹 ∈ 𝑊 ∧ 𝑍 ∈ 𝑉) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin)) | |
| 10 | 8, 2, 6, 9 | syl3anc 1397 | . 2 ⊢ (𝜑 → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin)) |
| 11 | 7, 10 | mpbird 260 | 1 ⊢ (𝜑 → 𝐹 finSupp 𝑍) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 = wceq 1569 ∈ wcel 2142 ∖ cdif 3901 class class class wbr 5108 dom cdm 5660 ↾ cres 5662 Fun wfun 6530 (class class class)co 7412 supp csupp 8154 Fincfn 8941 finSupp cfsupp 9319 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pr 5403 ax-un 7734 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1103 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3369 df-rab 3416 df-v 3456 df-sbc 3744 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-br 5109 df-opab 5173 df-tr 5218 df-id 5555 df-eprel 5560 df-po 5568 df-so 5569 df-fr 5613 df-we 5615 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-res 5672 df-ima 5673 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-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7861 df-supp 8155 df-1o 8451 df-en 8942 df-fin 8945 df-fsupp 9320 |
| This theorem is used by: lincext2 49263 |
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