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Mirrors > Home > MPE Home > Th. List > Mathboxes > nndivlub | Structured version Visualization version GIF version |
Description: A factor of a positive integer cannot exceed it. (Contributed by Jeff Hoffman, 17-Jun-2008.) |
Ref | Expression |
---|---|
nndivlub | ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ((𝐴 / 𝐵) ∈ ℕ → 𝐵 ≤ 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnre 11862 | . . 3 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℝ) | |
2 | nngt0 11886 | . . 3 ⊢ (𝐵 ∈ ℕ → 0 < 𝐵) | |
3 | 1, 2 | jca 515 | . 2 ⊢ (𝐵 ∈ ℕ → (𝐵 ∈ ℝ ∧ 0 < 𝐵)) |
4 | nnre 11862 | . . 3 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℝ) | |
5 | nngt0 11886 | . . 3 ⊢ (𝐴 ∈ ℕ → 0 < 𝐴) | |
6 | 4, 5 | jca 515 | . 2 ⊢ (𝐴 ∈ ℕ → (𝐴 ∈ ℝ ∧ 0 < 𝐴)) |
7 | nnge1 11883 | . . 3 ⊢ ((𝐴 / 𝐵) ∈ ℕ → 1 ≤ (𝐴 / 𝐵)) | |
8 | lediv2 11747 | . . . . 5 ⊢ (((𝐵 ∈ ℝ ∧ 0 < 𝐵) ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴) ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → (𝐵 ≤ 𝐴 ↔ (𝐴 / 𝐴) ≤ (𝐴 / 𝐵))) | |
9 | 8 | 3anidm23 1423 | . . . 4 ⊢ (((𝐵 ∈ ℝ ∧ 0 < 𝐵) ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → (𝐵 ≤ 𝐴 ↔ (𝐴 / 𝐴) ≤ (𝐴 / 𝐵))) |
10 | recn 10844 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
11 | 10 | adantr 484 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 ∈ ℂ) |
12 | gt0ne0 11322 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 𝐴 ≠ 0) | |
13 | divid 11544 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (𝐴 / 𝐴) = 1) | |
14 | 13 | breq1d 5078 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((𝐴 / 𝐴) ≤ (𝐴 / 𝐵) ↔ 1 ≤ (𝐴 / 𝐵))) |
15 | 11, 12, 14 | syl2anc 587 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → ((𝐴 / 𝐴) ≤ (𝐴 / 𝐵) ↔ 1 ≤ (𝐴 / 𝐵))) |
16 | 15 | adantl 485 | . . . 4 ⊢ (((𝐵 ∈ ℝ ∧ 0 < 𝐵) ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → ((𝐴 / 𝐴) ≤ (𝐴 / 𝐵) ↔ 1 ≤ (𝐴 / 𝐵))) |
17 | 9, 16 | bitrd 282 | . . 3 ⊢ (((𝐵 ∈ ℝ ∧ 0 < 𝐵) ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → (𝐵 ≤ 𝐴 ↔ 1 ≤ (𝐴 / 𝐵))) |
18 | 7, 17 | syl5ibr 249 | . 2 ⊢ (((𝐵 ∈ ℝ ∧ 0 < 𝐵) ∧ (𝐴 ∈ ℝ ∧ 0 < 𝐴)) → ((𝐴 / 𝐵) ∈ ℕ → 𝐵 ≤ 𝐴)) |
19 | 3, 6, 18 | syl2anr 600 | 1 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ((𝐴 / 𝐵) ∈ ℕ → 𝐵 ≤ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∈ wcel 2111 ≠ wne 2941 class class class wbr 5068 (class class class)co 7232 ℂcc 10752 ℝcr 10753 0cc0 10754 1c1 10755 < clt 10892 ≤ cle 10893 / cdiv 11514 ℕcn 11855 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2159 ax-12 2176 ax-ext 2709 ax-sep 5207 ax-nul 5214 ax-pow 5273 ax-pr 5337 ax-un 7542 ax-resscn 10811 ax-1cn 10812 ax-icn 10813 ax-addcl 10814 ax-addrcl 10815 ax-mulcl 10816 ax-mulrcl 10817 ax-mulcom 10818 ax-addass 10819 ax-mulass 10820 ax-distr 10821 ax-i2m1 10822 ax-1ne0 10823 ax-1rid 10824 ax-rnegex 10825 ax-rrecex 10826 ax-cnre 10827 ax-pre-lttri 10828 ax-pre-lttrn 10829 ax-pre-ltadd 10830 ax-pre-mulgt0 10831 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2072 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3067 df-rex 3068 df-reu 3069 df-rmo 3070 df-rab 3071 df-v 3423 df-sbc 3710 df-csb 3827 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4253 df-if 4455 df-pw 4530 df-sn 4557 df-pr 4559 df-tp 4561 df-op 4563 df-uni 4835 df-iun 4921 df-br 5069 df-opab 5131 df-mpt 5151 df-tr 5177 df-id 5470 df-eprel 5475 df-po 5483 df-so 5484 df-fr 5524 df-we 5526 df-xp 5572 df-rel 5573 df-cnv 5574 df-co 5575 df-dm 5576 df-rn 5577 df-res 5578 df-ima 5579 df-pred 6176 df-ord 6234 df-on 6235 df-lim 6236 df-suc 6237 df-iota 6356 df-fun 6400 df-fn 6401 df-f 6402 df-f1 6403 df-fo 6404 df-f1o 6405 df-fv 6406 df-riota 7189 df-ov 7235 df-oprab 7236 df-mpo 7237 df-om 7664 df-wrecs 8068 df-recs 8129 df-rdg 8167 df-er 8412 df-en 8648 df-dom 8649 df-sdom 8650 df-pnf 10894 df-mnf 10895 df-xr 10896 df-ltxr 10897 df-le 10898 df-sub 11089 df-neg 11090 df-div 11515 df-nn 11856 |
This theorem is referenced by: (None) |
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