Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > 2lgslem1a2 | Structured version Visualization version GIF version |
Description: Lemma 2 for 2lgslem1a 26444. (Contributed by AV, 18-Jun-2021.) |
Ref | Expression |
---|---|
2lgslem1a2 | ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((⌊‘(𝑁 / 4)) < 𝐼 ↔ (𝑁 / 2) < (𝐼 · 2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | zre 12253 | . . . . 5 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
2 | 1 | rehalfcld 12150 | . . . 4 ⊢ (𝑁 ∈ ℤ → (𝑁 / 2) ∈ ℝ) |
3 | 2 | adantr 480 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑁 / 2) ∈ ℝ) |
4 | id 22 | . . . . . 6 ⊢ (𝐼 ∈ ℤ → 𝐼 ∈ ℤ) | |
5 | 2z 12282 | . . . . . . 7 ⊢ 2 ∈ ℤ | |
6 | 5 | a1i 11 | . . . . . 6 ⊢ (𝐼 ∈ ℤ → 2 ∈ ℤ) |
7 | 4, 6 | zmulcld 12361 | . . . . 5 ⊢ (𝐼 ∈ ℤ → (𝐼 · 2) ∈ ℤ) |
8 | 7 | zred 12355 | . . . 4 ⊢ (𝐼 ∈ ℤ → (𝐼 · 2) ∈ ℝ) |
9 | 8 | adantl 481 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝐼 · 2) ∈ ℝ) |
10 | 2re 11977 | . . . . 5 ⊢ 2 ∈ ℝ | |
11 | 2pos 12006 | . . . . 5 ⊢ 0 < 2 | |
12 | 10, 11 | pm3.2i 470 | . . . 4 ⊢ (2 ∈ ℝ ∧ 0 < 2) |
13 | 12 | a1i 11 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (2 ∈ ℝ ∧ 0 < 2)) |
14 | ltdiv1 11769 | . . 3 ⊢ (((𝑁 / 2) ∈ ℝ ∧ (𝐼 · 2) ∈ ℝ ∧ (2 ∈ ℝ ∧ 0 < 2)) → ((𝑁 / 2) < (𝐼 · 2) ↔ ((𝑁 / 2) / 2) < ((𝐼 · 2) / 2))) | |
15 | 3, 9, 13, 14 | syl3anc 1369 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((𝑁 / 2) < (𝐼 · 2) ↔ ((𝑁 / 2) / 2) < ((𝐼 · 2) / 2))) |
16 | zcn 12254 | . . . . . 6 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℂ) | |
17 | 16 | adantr 480 | . . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝑁 ∈ ℂ) |
18 | 2cnne0 12113 | . . . . . 6 ⊢ (2 ∈ ℂ ∧ 2 ≠ 0) | |
19 | 18 | a1i 11 | . . . . 5 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (2 ∈ ℂ ∧ 2 ≠ 0)) |
20 | divdiv1 11616 | . . . . 5 ⊢ ((𝑁 ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0) ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) → ((𝑁 / 2) / 2) = (𝑁 / (2 · 2))) | |
21 | 17, 19, 19, 20 | syl3anc 1369 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((𝑁 / 2) / 2) = (𝑁 / (2 · 2))) |
22 | 2t2e4 12067 | . . . . 5 ⊢ (2 · 2) = 4 | |
23 | 22 | oveq2i 7266 | . . . 4 ⊢ (𝑁 / (2 · 2)) = (𝑁 / 4) |
24 | 21, 23 | eqtrdi 2795 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((𝑁 / 2) / 2) = (𝑁 / 4)) |
25 | zcn 12254 | . . . . 5 ⊢ (𝐼 ∈ ℤ → 𝐼 ∈ ℂ) | |
26 | 25 | adantl 481 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝐼 ∈ ℂ) |
27 | 2cnd 11981 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 2 ∈ ℂ) | |
28 | 2ne0 12007 | . . . . 5 ⊢ 2 ≠ 0 | |
29 | 28 | a1i 11 | . . . 4 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 2 ≠ 0) |
30 | 26, 27, 29 | divcan4d 11687 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((𝐼 · 2) / 2) = 𝐼) |
31 | 24, 30 | breq12d 5083 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (((𝑁 / 2) / 2) < ((𝐼 · 2) / 2) ↔ (𝑁 / 4) < 𝐼)) |
32 | 4re 11987 | . . . . 5 ⊢ 4 ∈ ℝ | |
33 | 32 | a1i 11 | . . . 4 ⊢ (𝑁 ∈ ℤ → 4 ∈ ℝ) |
34 | 4ne0 12011 | . . . . 5 ⊢ 4 ≠ 0 | |
35 | 34 | a1i 11 | . . . 4 ⊢ (𝑁 ∈ ℤ → 4 ≠ 0) |
36 | 1, 33, 35 | redivcld 11733 | . . 3 ⊢ (𝑁 ∈ ℤ → (𝑁 / 4) ∈ ℝ) |
37 | fllt 13454 | . . 3 ⊢ (((𝑁 / 4) ∈ ℝ ∧ 𝐼 ∈ ℤ) → ((𝑁 / 4) < 𝐼 ↔ (⌊‘(𝑁 / 4)) < 𝐼)) | |
38 | 36, 37 | sylan 579 | . 2 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((𝑁 / 4) < 𝐼 ↔ (⌊‘(𝑁 / 4)) < 𝐼)) |
39 | 15, 31, 38 | 3bitrrd 305 | 1 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → ((⌊‘(𝑁 / 4)) < 𝐼 ↔ (𝑁 / 2) < (𝐼 · 2))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 class class class wbr 5070 ‘cfv 6418 (class class class)co 7255 ℂcc 10800 ℝcr 10801 0cc0 10802 · cmul 10807 < clt 10940 / cdiv 11562 2c2 11958 4c4 11960 ℤcz 12249 ⌊cfl 13438 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-sup 9131 df-inf 9132 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-4 11968 df-n0 12164 df-z 12250 df-uz 12512 df-fl 13440 |
This theorem is referenced by: 2lgslem1a 26444 |
Copyright terms: Public domain | W3C validator |