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| Mirrors > Home > MPE Home > Th. List > fsuppunfi | Structured version Visualization version GIF version | ||
| Description: The union of the support of two finitely supported functions is finite. (Contributed by AV, 1-Jul-2019.) |
| Ref | Expression |
|---|---|
| fsuppun.f | ⊢ (𝜑 → 𝐹 finSupp 𝑍) |
| fsuppun.g | ⊢ (𝜑 → 𝐺 finSupp 𝑍) |
| Ref | Expression |
|---|---|
| fsuppunfi | ⊢ (𝜑 → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fsuppun.f | . 2 ⊢ (𝜑 → 𝐹 finSupp 𝑍) | |
| 2 | fsuppimp 9281 | . . 3 ⊢ (𝐹 finSupp 𝑍 → (Fun 𝐹 ∧ (𝐹 supp 𝑍) ∈ Fin)) | |
| 3 | fsuppun.g | . . . . 5 ⊢ (𝜑 → 𝐺 finSupp 𝑍) | |
| 4 | fsuppimp 9281 | . . . . 5 ⊢ (𝐺 finSupp 𝑍 → (Fun 𝐺 ∧ (𝐺 supp 𝑍) ∈ Fin)) | |
| 5 | unfi 9105 | . . . . . . 7 ⊢ (((𝐹 supp 𝑍) ∈ Fin ∧ (𝐺 supp 𝑍) ∈ Fin) → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin) | |
| 6 | 5 | expcom 413 | . . . . . 6 ⊢ ((𝐺 supp 𝑍) ∈ Fin → ((𝐹 supp 𝑍) ∈ Fin → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin)) |
| 7 | 6 | adantl 481 | . . . . 5 ⊢ ((Fun 𝐺 ∧ (𝐺 supp 𝑍) ∈ Fin) → ((𝐹 supp 𝑍) ∈ Fin → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin)) |
| 8 | 3, 4, 7 | 3syl 18 | . . . 4 ⊢ (𝜑 → ((𝐹 supp 𝑍) ∈ Fin → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin)) |
| 9 | 8 | com12 32 | . . 3 ⊢ ((𝐹 supp 𝑍) ∈ Fin → (𝜑 → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin)) |
| 10 | 2, 9 | simpl2im 503 | . 2 ⊢ (𝐹 finSupp 𝑍 → (𝜑 → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin)) |
| 11 | 1, 10 | mpcom 38 | 1 ⊢ (𝜑 → ((𝐹 supp 𝑍) ∪ (𝐺 supp 𝑍)) ∈ Fin) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2114 ∪ cun 3888 class class class wbr 5086 Fun wfun 6493 (class class class)co 7367 supp csupp 8110 Fincfn 8893 finSupp cfsupp 9274 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pr 5376 ax-un 7689 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-tr 5194 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-ord 6327 df-on 6328 df-lim 6329 df-suc 6330 df-iota 6455 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-ov 7370 df-om 7818 df-en 8894 df-fin 8897 df-fsupp 9275 |
| This theorem is referenced by: wemapso2lem 9467 dprdfadd 19997 psrbagaddcl 21904 mhpmulcl 22115 naddcnff 43790 |
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