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Mirrors > Home > MPE Home > Th. List > nn0ledivnn | Structured version Visualization version GIF version |
Description: Division of a nonnegative integer by a positive integer is less than or equal to the integer. (Contributed by AV, 19-Jun-2021.) |
Ref | Expression |
---|---|
nn0ledivnn | ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elnn0 11332 | . . 3 ⊢ (𝐴 ∈ ℕ0 ↔ (𝐴 ∈ ℕ ∨ 𝐴 = 0)) | |
2 | nnge1 11084 | . . . . . . 7 ⊢ (𝐵 ∈ ℕ → 1 ≤ 𝐵) | |
3 | 2 | adantl 481 | . . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → 1 ≤ 𝐵) |
4 | nnrp 11880 | . . . . . . 7 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℝ+) | |
5 | nnledivrp 11978 | . . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℝ+) → (1 ≤ 𝐵 ↔ (𝐴 / 𝐵) ≤ 𝐴)) | |
6 | 4, 5 | sylan2 490 | . . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (1 ≤ 𝐵 ↔ (𝐴 / 𝐵) ≤ 𝐴)) |
7 | 3, 6 | mpbid 222 | . . . . 5 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
8 | 7 | ex 449 | . . . 4 ⊢ (𝐴 ∈ ℕ → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
9 | nncn 11066 | . . . . . . . . . 10 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℂ) | |
10 | nnne0 11091 | . . . . . . . . . 10 ⊢ (𝐵 ∈ ℕ → 𝐵 ≠ 0) | |
11 | 9, 10 | jca 553 | . . . . . . . . 9 ⊢ (𝐵 ∈ ℕ → (𝐵 ∈ ℂ ∧ 𝐵 ≠ 0)) |
12 | 11 | adantl 481 | . . . . . . . 8 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (𝐵 ∈ ℂ ∧ 𝐵 ≠ 0)) |
13 | div0 10753 | . . . . . . . 8 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 ≠ 0) → (0 / 𝐵) = 0) | |
14 | 12, 13 | syl 17 | . . . . . . 7 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (0 / 𝐵) = 0) |
15 | 0le0 11148 | . . . . . . 7 ⊢ 0 ≤ 0 | |
16 | 14, 15 | syl6eqbr 4724 | . . . . . 6 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (0 / 𝐵) ≤ 0) |
17 | oveq1 6697 | . . . . . . . 8 ⊢ (𝐴 = 0 → (𝐴 / 𝐵) = (0 / 𝐵)) | |
18 | id 22 | . . . . . . . 8 ⊢ (𝐴 = 0 → 𝐴 = 0) | |
19 | 17, 18 | breq12d 4698 | . . . . . . 7 ⊢ (𝐴 = 0 → ((𝐴 / 𝐵) ≤ 𝐴 ↔ (0 / 𝐵) ≤ 0)) |
20 | 19 | adantr 480 | . . . . . 6 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → ((𝐴 / 𝐵) ≤ 𝐴 ↔ (0 / 𝐵) ≤ 0)) |
21 | 16, 20 | mpbird 247 | . . . . 5 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
22 | 21 | ex 449 | . . . 4 ⊢ (𝐴 = 0 → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
23 | 8, 22 | jaoi 393 | . . 3 ⊢ ((𝐴 ∈ ℕ ∨ 𝐴 = 0) → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
24 | 1, 23 | sylbi 207 | . 2 ⊢ (𝐴 ∈ ℕ0 → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
25 | 24 | imp 444 | 1 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∨ wo 382 ∧ wa 383 = wceq 1523 ∈ wcel 2030 ≠ wne 2823 class class class wbr 4685 (class class class)co 6690 ℂcc 9972 0cc0 9974 1c1 9975 ≤ cle 10113 / cdiv 10722 ℕcn 11058 ℕ0cn0 11330 ℝ+crp 11870 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1762 ax-4 1777 ax-5 1879 ax-6 1945 ax-7 1981 ax-8 2032 ax-9 2039 ax-10 2059 ax-11 2074 ax-12 2087 ax-13 2282 ax-ext 2631 ax-sep 4814 ax-nul 4822 ax-pow 4873 ax-pr 4936 ax-un 6991 ax-resscn 10031 ax-1cn 10032 ax-icn 10033 ax-addcl 10034 ax-addrcl 10035 ax-mulcl 10036 ax-mulrcl 10037 ax-mulcom 10038 ax-addass 10039 ax-mulass 10040 ax-distr 10041 ax-i2m1 10042 ax-1ne0 10043 ax-1rid 10044 ax-rnegex 10045 ax-rrecex 10046 ax-cnre 10047 ax-pre-lttri 10048 ax-pre-lttrn 10049 ax-pre-ltadd 10050 ax-pre-mulgt0 10051 |
This theorem depends on definitions: df-bi 197 df-or 384 df-an 385 df-3or 1055 df-3an 1056 df-tru 1526 df-ex 1745 df-nf 1750 df-sb 1938 df-eu 2502 df-mo 2503 df-clab 2638 df-cleq 2644 df-clel 2647 df-nfc 2782 df-ne 2824 df-nel 2927 df-ral 2946 df-rex 2947 df-reu 2948 df-rmo 2949 df-rab 2950 df-v 3233 df-sbc 3469 df-csb 3567 df-dif 3610 df-un 3612 df-in 3614 df-ss 3621 df-pss 3623 df-nul 3949 df-if 4120 df-pw 4193 df-sn 4211 df-pr 4213 df-tp 4215 df-op 4217 df-uni 4469 df-iun 4554 df-br 4686 df-opab 4746 df-mpt 4763 df-tr 4786 df-id 5053 df-eprel 5058 df-po 5064 df-so 5065 df-fr 5102 df-we 5104 df-xp 5149 df-rel 5150 df-cnv 5151 df-co 5152 df-dm 5153 df-rn 5154 df-res 5155 df-ima 5156 df-pred 5718 df-ord 5764 df-on 5765 df-lim 5766 df-suc 5767 df-iota 5889 df-fun 5928 df-fn 5929 df-f 5930 df-f1 5931 df-fo 5932 df-f1o 5933 df-fv 5934 df-riota 6651 df-ov 6693 df-oprab 6694 df-mpt2 6695 df-om 7108 df-wrecs 7452 df-recs 7513 df-rdg 7551 df-er 7787 df-en 7998 df-dom 7999 df-sdom 8000 df-pnf 10114 df-mnf 10115 df-xr 10116 df-ltxr 10117 df-le 10118 df-sub 10306 df-neg 10307 df-div 10723 df-nn 11059 df-n0 11331 df-rp 11871 |
This theorem is referenced by: 2lgslem1c 25163 |
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