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| Mirrors > Home > MPE Home > Th. List > fndmfisuppfi | Structured version Visualization version GIF version | ||
| Description: The support of a function with a finite domain is always finite. (Contributed by AV, 25-May-2019.) |
| Ref | Expression |
|---|---|
| fndmfisuppfi.f | ⊢ (𝜑 → 𝐹 Fn 𝐷) |
| fndmfisuppfi.d | ⊢ (𝜑 → 𝐷 ∈ Fin) |
| fndmfisuppfi.z | ⊢ (𝜑 → 𝑍 ∈ 𝑉) |
| Ref | Expression |
|---|---|
| fndmfisuppfi | ⊢ (𝜑 → (𝐹 supp 𝑍) ∈ Fin) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fndmfisuppfi.f | . . 3 ⊢ (𝜑 → 𝐹 Fn 𝐷) | |
| 2 | dffn3 6669 | . . 3 ⊢ (𝐹 Fn 𝐷 ↔ 𝐹:𝐷⟶ran 𝐹) | |
| 3 | 1, 2 | sylib 218 | . 2 ⊢ (𝜑 → 𝐹:𝐷⟶ran 𝐹) |
| 4 | fndmfisuppfi.d | . 2 ⊢ (𝜑 → 𝐷 ∈ Fin) | |
| 5 | fndmfisuppfi.z | . 2 ⊢ (𝜑 → 𝑍 ∈ 𝑉) | |
| 6 | 3, 4, 5 | fdmfisuppfi 9276 | 1 ⊢ (𝜑 → (𝐹 supp 𝑍) ∈ Fin) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ran crn 5621 Fn wfn 6482 ⟶wf 6483 (class class class)co 7356 supp csupp 8099 Fincfn 8882 |
| 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 2184 ax-ext 2707 ax-rep 5201 ax-sep 5220 ax-nul 5230 ax-pr 5364 ax-un 7678 |
| 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 2538 df-eu 2568 df-clab 2714 df-cleq 2727 df-clel 2810 df-nfc 2884 df-ne 2931 df-ral 3050 df-rex 3060 df-reu 3341 df-rab 3388 df-v 3429 df-sbc 3726 df-csb 3834 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-tr 5182 df-id 5515 df-eprel 5520 df-po 5528 df-so 5529 df-fr 5573 df-we 5575 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-ord 6315 df-on 6316 df-lim 6317 df-suc 6318 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-ov 7359 df-oprab 7360 df-mpo 7361 df-om 7807 df-supp 8100 df-1o 8394 df-en 8883 df-fin 8886 |
| This theorem is referenced by: (None) |
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