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Mirrors > Home > ILE Home > Th. List > 0fz1 | GIF version |
Description: Two ways to say a finite 1-based sequence is empty. (Contributed by Paul Chapman, 26-Oct-2012.) |
Ref | Expression |
---|---|
0fz1 | ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐹 Fn (1...𝑁)) → (𝐹 = ∅ ↔ 𝑁 = 0)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fn0 5307 | . . . . 5 ⊢ (𝐹 Fn ∅ ↔ 𝐹 = ∅) | |
2 | fndmu 5289 | . . . . 5 ⊢ ((𝐹 Fn (1...𝑁) ∧ 𝐹 Fn ∅) → (1...𝑁) = ∅) | |
3 | 1, 2 | sylan2br 286 | . . . 4 ⊢ ((𝐹 Fn (1...𝑁) ∧ 𝐹 = ∅) → (1...𝑁) = ∅) |
4 | 3 | ex 114 | . . 3 ⊢ (𝐹 Fn (1...𝑁) → (𝐹 = ∅ → (1...𝑁) = ∅)) |
5 | fneq2 5277 | . . . . 5 ⊢ ((1...𝑁) = ∅ → (𝐹 Fn (1...𝑁) ↔ 𝐹 Fn ∅)) | |
6 | 5, 1 | bitrdi 195 | . . . 4 ⊢ ((1...𝑁) = ∅ → (𝐹 Fn (1...𝑁) ↔ 𝐹 = ∅)) |
7 | 6 | biimpcd 158 | . . 3 ⊢ (𝐹 Fn (1...𝑁) → ((1...𝑁) = ∅ → 𝐹 = ∅)) |
8 | 4, 7 | impbid 128 | . 2 ⊢ (𝐹 Fn (1...𝑁) → (𝐹 = ∅ ↔ (1...𝑁) = ∅)) |
9 | fz1n 9979 | . 2 ⊢ (𝑁 ∈ ℕ0 → ((1...𝑁) = ∅ ↔ 𝑁 = 0)) | |
10 | 8, 9 | sylan9bbr 459 | 1 ⊢ ((𝑁 ∈ ℕ0 ∧ 𝐹 Fn (1...𝑁)) → (𝐹 = ∅ ↔ 𝑁 = 0)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1343 ∈ wcel 2136 ∅c0 3409 Fn wfn 5183 (class class class)co 5842 0cc0 7753 1c1 7754 ℕ0cn0 9114 ...cfz 9944 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-nul 4108 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-addcom 7853 ax-addass 7855 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-0id 7861 ax-rnegex 7862 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 |
This theorem depends on definitions: df-bi 116 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rab 2453 df-v 2728 df-sbc 2952 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-br 3983 df-opab 4044 df-mpt 4045 df-id 4271 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-inn 8858 df-n0 9115 df-z 9192 df-uz 9467 df-fz 9945 |
This theorem is referenced by: (None) |
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