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Mirrors > Home > ILE Home > Th. List > nn0ledivnn | 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 8877 | . . 3 ⊢ (𝐴 ∈ ℕ0 ↔ (𝐴 ∈ ℕ ∨ 𝐴 = 0)) | |
2 | nnge1 8647 | . . . . . . 7 ⊢ (𝐵 ∈ ℕ → 1 ≤ 𝐵) | |
3 | 2 | adantl 273 | . . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → 1 ≤ 𝐵) |
4 | nnrp 9346 | . . . . . . 7 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℝ+) | |
5 | nnledivrp 9440 | . . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℝ+) → (1 ≤ 𝐵 ↔ (𝐴 / 𝐵) ≤ 𝐴)) | |
6 | 4, 5 | sylan2 282 | . . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (1 ≤ 𝐵 ↔ (𝐴 / 𝐵) ≤ 𝐴)) |
7 | 3, 6 | mpbid 146 | . . . . 5 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
8 | 7 | ex 114 | . . . 4 ⊢ (𝐴 ∈ ℕ → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
9 | nncn 8632 | . . . . . . . . . 10 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℂ) | |
10 | nnap0 8653 | . . . . . . . . . 10 ⊢ (𝐵 ∈ ℕ → 𝐵 # 0) | |
11 | 9, 10 | jca 302 | . . . . . . . . 9 ⊢ (𝐵 ∈ ℕ → (𝐵 ∈ ℂ ∧ 𝐵 # 0)) |
12 | 11 | adantl 273 | . . . . . . . 8 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (𝐵 ∈ ℂ ∧ 𝐵 # 0)) |
13 | div0ap 8369 | . . . . . . . 8 ⊢ ((𝐵 ∈ ℂ ∧ 𝐵 # 0) → (0 / 𝐵) = 0) | |
14 | 12, 13 | syl 14 | . . . . . . 7 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (0 / 𝐵) = 0) |
15 | 0le0 8713 | . . . . . . 7 ⊢ 0 ≤ 0 | |
16 | 14, 15 | syl6eqbr 3930 | . . . . . 6 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (0 / 𝐵) ≤ 0) |
17 | oveq1 5733 | . . . . . . . 8 ⊢ (𝐴 = 0 → (𝐴 / 𝐵) = (0 / 𝐵)) | |
18 | id 19 | . . . . . . . 8 ⊢ (𝐴 = 0 → 𝐴 = 0) | |
19 | 17, 18 | breq12d 3906 | . . . . . . 7 ⊢ (𝐴 = 0 → ((𝐴 / 𝐵) ≤ 𝐴 ↔ (0 / 𝐵) ≤ 0)) |
20 | 19 | adantr 272 | . . . . . 6 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → ((𝐴 / 𝐵) ≤ 𝐴 ↔ (0 / 𝐵) ≤ 0)) |
21 | 16, 20 | mpbird 166 | . . . . 5 ⊢ ((𝐴 = 0 ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
22 | 21 | ex 114 | . . . 4 ⊢ (𝐴 = 0 → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
23 | 8, 22 | jaoi 688 | . . 3 ⊢ ((𝐴 ∈ ℕ ∨ 𝐴 = 0) → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
24 | 1, 23 | sylbi 120 | . 2 ⊢ (𝐴 ∈ ℕ0 → (𝐵 ∈ ℕ → (𝐴 / 𝐵) ≤ 𝐴)) |
25 | 24 | imp 123 | 1 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ) → (𝐴 / 𝐵) ≤ 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 ∨ wo 680 = wceq 1312 ∈ wcel 1461 class class class wbr 3893 (class class class)co 5726 ℂcc 7539 0cc0 7541 1c1 7542 ≤ cle 7719 # cap 8255 / cdiv 8339 ℕcn 8624 ℕ0cn0 8875 ℝ+crp 9337 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 586 ax-in2 587 ax-io 681 ax-5 1404 ax-7 1405 ax-gen 1406 ax-ie1 1450 ax-ie2 1451 ax-8 1463 ax-10 1464 ax-11 1465 ax-i12 1466 ax-bndl 1467 ax-4 1468 ax-13 1472 ax-14 1473 ax-17 1487 ax-i9 1491 ax-ial 1495 ax-i5r 1496 ax-ext 2095 ax-sep 4004 ax-pow 4056 ax-pr 4089 ax-un 4313 ax-setind 4410 ax-cnex 7630 ax-resscn 7631 ax-1cn 7632 ax-1re 7633 ax-icn 7634 ax-addcl 7635 ax-addrcl 7636 ax-mulcl 7637 ax-mulrcl 7638 ax-addcom 7639 ax-mulcom 7640 ax-addass 7641 ax-mulass 7642 ax-distr 7643 ax-i2m1 7644 ax-0lt1 7645 ax-1rid 7646 ax-0id 7647 ax-rnegex 7648 ax-precex 7649 ax-cnre 7650 ax-pre-ltirr 7651 ax-pre-ltwlin 7652 ax-pre-lttrn 7653 ax-pre-apti 7654 ax-pre-ltadd 7655 ax-pre-mulgt0 7656 ax-pre-mulext 7657 |
This theorem depends on definitions: df-bi 116 df-3an 945 df-tru 1315 df-fal 1318 df-nf 1418 df-sb 1717 df-eu 1976 df-mo 1977 df-clab 2100 df-cleq 2106 df-clel 2109 df-nfc 2242 df-ne 2281 df-nel 2376 df-ral 2393 df-rex 2394 df-reu 2395 df-rmo 2396 df-rab 2397 df-v 2657 df-sbc 2877 df-dif 3037 df-un 3039 df-in 3041 df-ss 3048 df-pw 3476 df-sn 3497 df-pr 3498 df-op 3500 df-uni 3701 df-int 3736 df-br 3894 df-opab 3948 df-id 4173 df-po 4176 df-iso 4177 df-xp 4503 df-rel 4504 df-cnv 4505 df-co 4506 df-dm 4507 df-iota 5044 df-fun 5081 df-fv 5087 df-riota 5682 df-ov 5729 df-oprab 5730 df-mpo 5731 df-pnf 7720 df-mnf 7721 df-xr 7722 df-ltxr 7723 df-le 7724 df-sub 7852 df-neg 7853 df-reap 8249 df-ap 8256 df-div 8340 df-inn 8625 df-n0 8876 df-rp 9338 |
This theorem is referenced by: (None) |
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