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| Mirrors > Home > ILE Home > Th. List > fcdmnn0fsupp | GIF version | ||
| Description: A function into ℕ0 is finitely supported iff its support is finite. (Contributed by AV, 8-Jul-2019.) |
| Ref | Expression |
|---|---|
| fcdmnn0fsupp | ⊢ ((𝐼 ∈ 𝑉 ∧ 𝐹:𝐼⟶ℕ0) → (𝐹 finSupp 0 ↔ (◡𝐹 “ ℕ) ∈ Fin)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | c0ex 8273 | . . . 4 ⊢ 0 ∈ V | |
| 2 | ffsuppbi 7255 | . . . 4 ⊢ ((𝐼 ∈ 𝑉 ∧ 0 ∈ V) → (𝐹:𝐼⟶ℕ0 → (𝐹 finSupp 0 ↔ (◡𝐹 “ (ℕ0 ∖ {0})) ∈ Fin))) | |
| 3 | 1, 2 | mpan2 425 | . . 3 ⊢ (𝐼 ∈ 𝑉 → (𝐹:𝐼⟶ℕ0 → (𝐹 finSupp 0 ↔ (◡𝐹 “ (ℕ0 ∖ {0})) ∈ Fin))) |
| 4 | 3 | imp 124 | . 2 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝐹:𝐼⟶ℕ0) → (𝐹 finSupp 0 ↔ (◡𝐹 “ (ℕ0 ∖ {0})) ∈ Fin)) |
| 5 | dfn2 9514 | . . . 4 ⊢ ℕ = (ℕ0 ∖ {0}) | |
| 6 | 5 | imaeq2i 5101 | . . 3 ⊢ (◡𝐹 “ ℕ) = (◡𝐹 “ (ℕ0 ∖ {0})) |
| 7 | 6 | eleq1i 2300 | . 2 ⊢ ((◡𝐹 “ ℕ) ∈ Fin ↔ (◡𝐹 “ (ℕ0 ∖ {0})) ∈ Fin) |
| 8 | 4, 7 | bitr4di 198 | 1 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝐹:𝐼⟶ℕ0) → (𝐹 finSupp 0 ↔ (◡𝐹 “ ℕ) ∈ Fin)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2205 Vcvv 2815 ∖ cdif 3210 {csn 3691 class class class wbr 4111 ◡ccnv 4750 “ cima 4754 ⟶wf 5350 Fincfn 6977 finSupp cfsupp 7240 0cc0 8132 ℕcn 9242 ℕ0cn0 9501 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-coll 4227 ax-sep 4230 ax-pow 4289 ax-pr 4324 ax-un 4556 ax-setind 4661 ax-cnex 8223 ax-resscn 8224 ax-1cn 8225 ax-1re 8226 ax-icn 8227 ax-addcl 8228 ax-addrcl 8229 ax-mulcl 8230 ax-i2m1 8237 ax-0lt1 8238 ax-0id 8240 ax-rnegex 8241 ax-pre-ltirr 8244 ax-pre-lttrn 8246 ax-pre-ltadd 8248 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-reu 2529 df-rab 2531 df-v 2817 df-sbc 3045 df-csb 3141 df-dif 3215 df-un 3217 df-in 3219 df-ss 3226 df-nul 3511 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-int 3952 df-iun 3995 df-br 4112 df-opab 4174 df-mpt 4175 df-id 4416 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-rn 4762 df-res 4763 df-ima 4764 df-iota 5314 df-fun 5356 df-fn 5357 df-f 5358 df-f1 5359 df-fo 5360 df-f1o 5361 df-fv 5362 df-ov 6055 df-oprab 6056 df-mpo 6057 df-supp 6438 df-fsupp 7241 df-pnf 8315 df-mnf 8316 df-xr 8317 df-ltxr 8318 df-le 8319 df-inn 9243 df-n0 9502 |
| This theorem is referenced by: (None) |
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