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Mathbox for Rohan Ridenour |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > finnzfsuppd | Structured version Visualization version GIF version |
Description: If a function is zero outside of a finite set, it has finite support. (Contributed by Rohan Ridenour, 13-May-2024.) |
Ref | Expression |
---|---|
finnzfsuppd.1 | ⊢ (𝜑 → 𝐹 ∈ 𝑉) |
finnzfsuppd.2 | ⊢ (𝜑 → 𝐹 Fn 𝐷) |
finnzfsuppd.3 | ⊢ (𝜑 → 𝑍 ∈ 𝑈) |
finnzfsuppd.4 | ⊢ (𝜑 → 𝐴 ∈ Fin) |
finnzfsuppd.5 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (𝑥 ∈ 𝐴 ∨ (𝐹‘𝑥) = 𝑍)) |
Ref | Expression |
---|---|
finnzfsuppd | ⊢ (𝜑 → 𝐹 finSupp 𝑍) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | finnzfsuppd.4 | . . 3 ⊢ (𝜑 → 𝐴 ∈ Fin) | |
2 | finnzfsuppd.2 | . . . . . . . . . 10 ⊢ (𝜑 → 𝐹 Fn 𝐷) | |
3 | finnzfsuppd.1 | . . . . . . . . . . 11 ⊢ (𝜑 → 𝐹 ∈ 𝑉) | |
4 | 3, 2 | fndmexd 7609 | . . . . . . . . . 10 ⊢ (𝜑 → 𝐷 ∈ V) |
5 | finnzfsuppd.3 | . . . . . . . . . 10 ⊢ (𝜑 → 𝑍 ∈ 𝑈) | |
6 | elsuppfn 7838 | . . . . . . . . . 10 ⊢ ((𝐹 Fn 𝐷 ∧ 𝐷 ∈ V ∧ 𝑍 ∈ 𝑈) → (𝑥 ∈ (𝐹 supp 𝑍) ↔ (𝑥 ∈ 𝐷 ∧ (𝐹‘𝑥) ≠ 𝑍))) | |
7 | 2, 4, 5, 6 | syl3anc 1369 | . . . . . . . . 9 ⊢ (𝜑 → (𝑥 ∈ (𝐹 supp 𝑍) ↔ (𝑥 ∈ 𝐷 ∧ (𝐹‘𝑥) ≠ 𝑍))) |
8 | 7 | biimpa 481 | . . . . . . . 8 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐹 supp 𝑍)) → (𝑥 ∈ 𝐷 ∧ (𝐹‘𝑥) ≠ 𝑍)) |
9 | 8 | simpld 499 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐹 supp 𝑍)) → 𝑥 ∈ 𝐷) |
10 | finnzfsuppd.5 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (𝑥 ∈ 𝐴 ∨ (𝐹‘𝑥) = 𝑍)) | |
11 | 9, 10 | syldan 595 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐹 supp 𝑍)) → (𝑥 ∈ 𝐴 ∨ (𝐹‘𝑥) = 𝑍)) |
12 | 8 | simprd 500 | . . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐹 supp 𝑍)) → (𝐹‘𝑥) ≠ 𝑍) |
13 | 12 | neneqd 2954 | . . . . . 6 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐹 supp 𝑍)) → ¬ (𝐹‘𝑥) = 𝑍) |
14 | 11, 13 | olcnd 875 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐹 supp 𝑍)) → 𝑥 ∈ 𝐴) |
15 | 14 | ex 417 | . . . 4 ⊢ (𝜑 → (𝑥 ∈ (𝐹 supp 𝑍) → 𝑥 ∈ 𝐴)) |
16 | 15 | ssrdv 3894 | . . 3 ⊢ (𝜑 → (𝐹 supp 𝑍) ⊆ 𝐴) |
17 | 1, 16 | ssfid 8755 | . 2 ⊢ (𝜑 → (𝐹 supp 𝑍) ∈ Fin) |
18 | fnfun 6427 | . . . 4 ⊢ (𝐹 Fn 𝐷 → Fun 𝐹) | |
19 | 2, 18 | syl 17 | . . 3 ⊢ (𝜑 → Fun 𝐹) |
20 | funisfsupp 8856 | . . 3 ⊢ ((Fun 𝐹 ∧ 𝐹 ∈ 𝑉 ∧ 𝑍 ∈ 𝑈) → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin)) | |
21 | 19, 3, 5, 20 | syl3anc 1369 | . 2 ⊢ (𝜑 → (𝐹 finSupp 𝑍 ↔ (𝐹 supp 𝑍) ∈ Fin)) |
22 | 17, 21 | mpbird 260 | 1 ⊢ (𝜑 → 𝐹 finSupp 𝑍) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 400 ∨ wo 845 = wceq 1539 ∈ wcel 2112 ≠ wne 2949 Vcvv 3407 class class class wbr 5025 Fun wfun 6322 Fn wfn 6323 ‘cfv 6328 (class class class)co 7143 supp csupp 7828 Fincfn 8520 finSupp cfsupp 8851 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1912 ax-6 1971 ax-7 2016 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2159 ax-12 2176 ax-ext 2730 ax-rep 5149 ax-sep 5162 ax-nul 5169 ax-pow 5227 ax-pr 5291 ax-un 7452 |
This theorem depends on definitions: df-bi 210 df-an 401 df-or 846 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2071 df-mo 2558 df-eu 2589 df-clab 2737 df-cleq 2751 df-clel 2831 df-nfc 2899 df-ne 2950 df-ral 3073 df-rex 3074 df-reu 3075 df-rab 3077 df-v 3409 df-sbc 3694 df-csb 3802 df-dif 3857 df-un 3859 df-in 3861 df-ss 3871 df-pss 3873 df-nul 4222 df-if 4414 df-pw 4489 df-sn 4516 df-pr 4518 df-tp 4520 df-op 4522 df-uni 4792 df-iun 4878 df-br 5026 df-opab 5088 df-mpt 5106 df-tr 5132 df-id 5423 df-eprel 5428 df-po 5436 df-so 5437 df-fr 5476 df-we 5478 df-xp 5523 df-rel 5524 df-cnv 5525 df-co 5526 df-dm 5527 df-rn 5528 df-res 5529 df-ima 5530 df-ord 6165 df-on 6166 df-lim 6167 df-suc 6168 df-iota 6287 df-fun 6330 df-fn 6331 df-f 6332 df-f1 6333 df-fo 6334 df-f1o 6335 df-fv 6336 df-ov 7146 df-oprab 7147 df-mpo 7148 df-om 7573 df-supp 7829 df-er 8292 df-en 8521 df-fin 8524 df-fsupp 8852 |
This theorem is referenced by: mnringmulrcld 41294 |
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