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| Mirrors > Home > MPE Home > Th. List > nn0lt10b | Structured version Visualization version GIF version | ||
| Description: A nonnegative integer less than 1 is 0. (Contributed by Paul Chapman, 22-Jun-2011.) (Proof shortened by OpenAI, 25-Mar-2020.) |
| Ref | Expression |
|---|---|
| nn0lt10b | ⊢ (𝑁 ∈ ℕ0 → (𝑁 < 1 ↔ 𝑁 = 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elnn0 12648 | . . 3 ⊢ (𝑁 ∈ ℕ0 ↔ (𝑁 ∈ ℕ ∨ 𝑁 = 0)) | |
| 2 | nnnlt1 12410 | . . . . 5 ⊢ (𝑁 ∈ ℕ → ¬ 𝑁 < 1) | |
| 3 | 2 | pm2.21d 122 | . . . 4 ⊢ (𝑁 ∈ ℕ → (𝑁 < 1 → 𝑁 = 0)) |
| 4 | ax-1 6 | . . . 4 ⊢ (𝑁 = 0 → (𝑁 < 1 → 𝑁 = 0)) | |
| 5 | 3, 4 | jaoi 871 | . . 3 ⊢ ((𝑁 ∈ ℕ ∨ 𝑁 = 0) → (𝑁 < 1 → 𝑁 = 0)) |
| 6 | 1, 5 | sylbi 220 | . 2 ⊢ (𝑁 ∈ ℕ0 → (𝑁 < 1 → 𝑁 = 0)) |
| 7 | 0lt1 11878 | . . 3 ⊢ 0 < 1 | |
| 8 | breq1 5111 | . . 3 ⊢ (𝑁 = 0 → (𝑁 < 1 ↔ 0 < 1)) | |
| 9 | 7, 8 | mpbiri 261 | . 2 ⊢ (𝑁 = 0 → 𝑁 < 1) |
| 10 | 6, 9 | impbid1 228 | 1 ⊢ (𝑁 ∈ ℕ0 → (𝑁 < 1 ↔ 𝑁 = 0)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∨ wo 861 = wceq 1570 ∈ wcel 2147 class class class wbr 5108 0cc0 11239 1c1 11240 < clt 11382 ℕcn 12375 ℕ0cn0 12646 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 ax-pr 5398 ax-un 7783 ax-resscn 11296 ax-1cn 11297 ax-icn 11298 ax-addcl 11299 ax-addrcl 11300 ax-mulcl 11301 ax-mulrcl 11302 ax-mulcom 11303 ax-addass 11304 ax-mulass 11305 ax-distr 11306 ax-i2m1 11307 ax-1ne0 11308 ax-1rid 11309 ax-rnegex 11310 ax-rrecex 11311 ax-cnre 11312 ax-pre-lttri 11313 ax-pre-lttrn 11314 ax-pre-ltadd 11315 ax-pre-mulgt0 11316 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5553 df-eprel 5558 df-po 5566 df-so 5567 df-fr 5611 df-we 5613 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-pred 6330 df-ord 6391 df-on 6392 df-lim 6393 df-suc 6394 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-riota 7408 df-ov 7454 df-oprab 7455 df-mpo 7456 df-om 7912 df-2nd 8036 df-frecs 8337 df-wrecs 8368 df-recs 8417 df-rdg 8456 df-er 8755 df-en 9012 df-dom 9013 df-sdom 9014 df-pnf 11384 df-mnf 11385 df-xr 11386 df-ltxr 11387 df-le 11388 df-sub 11582 df-neg 11583 df-nn 12376 df-n0 12647 |
| This theorem is used by: nn0lt2 12802 nn0le2is012 12803 fz1n 13715 zabs0b 15524 zdis 25191 plyrem 26681 efif1olem4 26930 acycgr1v 36112 poimirlem28 38834 |
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