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Mirrors > Home > MPE Home > Th. List > Mathboxes > dnibndlem12 | Structured version Visualization version GIF version |
Description: Lemma for dnibnd 33837. (Contributed by Asger C. Ipsen, 4-Apr-2021.) |
Ref | Expression |
---|---|
dnibndlem12.1 | ⊢ 𝑇 = (𝑥 ∈ ℝ ↦ (abs‘((⌊‘(𝑥 + (1 / 2))) − 𝑥))) |
dnibndlem12.2 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
dnibndlem12.3 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
dnibndlem12.4 | ⊢ (𝜑 → ((⌊‘(𝐴 + (1 / 2))) + 2) ≤ (⌊‘(𝐵 + (1 / 2)))) |
Ref | Expression |
---|---|
dnibndlem12 | ⊢ (𝜑 → (abs‘((𝑇‘𝐵) − (𝑇‘𝐴))) ≤ (abs‘(𝐵 − 𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dnibndlem12.3 | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
2 | 1 | dnicld1 33818 | . . . . . 6 ⊢ (𝜑 → (abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) ∈ ℝ) |
3 | dnibndlem12.2 | . . . . . . 7 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
4 | 3 | dnicld1 33818 | . . . . . 6 ⊢ (𝜑 → (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴)) ∈ ℝ) |
5 | 2, 4 | resubcld 11054 | . . . . 5 ⊢ (𝜑 → ((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴))) ∈ ℝ) |
6 | 5 | recnd 10655 | . . . 4 ⊢ (𝜑 → ((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴))) ∈ ℂ) |
7 | 6 | abscld 14781 | . . 3 ⊢ (𝜑 → (abs‘((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴)))) ∈ ℝ) |
8 | 1red 10628 | . . 3 ⊢ (𝜑 → 1 ∈ ℝ) | |
9 | 1, 3 | resubcld 11054 | . . . . 5 ⊢ (𝜑 → (𝐵 − 𝐴) ∈ ℝ) |
10 | 9 | recnd 10655 | . . . 4 ⊢ (𝜑 → (𝐵 − 𝐴) ∈ ℂ) |
11 | 10 | abscld 14781 | . . 3 ⊢ (𝜑 → (abs‘(𝐵 − 𝐴)) ∈ ℝ) |
12 | 8 | rehalfcld 11871 | . . . 4 ⊢ (𝜑 → (1 / 2) ∈ ℝ) |
13 | 3, 1 | dnibndlem11 33834 | . . . 4 ⊢ (𝜑 → (abs‘((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴)))) ≤ (1 / 2)) |
14 | halflt1 11842 | . . . . . 6 ⊢ (1 / 2) < 1 | |
15 | halfre 11838 | . . . . . . . 8 ⊢ (1 / 2) ∈ ℝ | |
16 | 1re 10627 | . . . . . . . 8 ⊢ 1 ∈ ℝ | |
17 | 15, 16 | pm3.2i 473 | . . . . . . 7 ⊢ ((1 / 2) ∈ ℝ ∧ 1 ∈ ℝ) |
18 | ltle 10715 | . . . . . . 7 ⊢ (((1 / 2) ∈ ℝ ∧ 1 ∈ ℝ) → ((1 / 2) < 1 → (1 / 2) ≤ 1)) | |
19 | 17, 18 | ax-mp 5 | . . . . . 6 ⊢ ((1 / 2) < 1 → (1 / 2) ≤ 1) |
20 | 14, 19 | ax-mp 5 | . . . . 5 ⊢ (1 / 2) ≤ 1 |
21 | 20 | a1i 11 | . . . 4 ⊢ (𝜑 → (1 / 2) ≤ 1) |
22 | 7, 12, 8, 13, 21 | letrd 10783 | . . 3 ⊢ (𝜑 → (abs‘((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴)))) ≤ 1) |
23 | dnibndlem12.4 | . . . . 5 ⊢ (𝜑 → ((⌊‘(𝐴 + (1 / 2))) + 2) ≤ (⌊‘(𝐵 + (1 / 2)))) | |
24 | 3, 1, 23 | dnibndlem10 33833 | . . . 4 ⊢ (𝜑 → 1 ≤ (𝐵 − 𝐴)) |
25 | 9 | leabsd 14759 | . . . 4 ⊢ (𝜑 → (𝐵 − 𝐴) ≤ (abs‘(𝐵 − 𝐴))) |
26 | 8, 9, 11, 24, 25 | letrd 10783 | . . 3 ⊢ (𝜑 → 1 ≤ (abs‘(𝐵 − 𝐴))) |
27 | 7, 8, 11, 22, 26 | letrd 10783 | . 2 ⊢ (𝜑 → (abs‘((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴)))) ≤ (abs‘(𝐵 − 𝐴))) |
28 | dnibndlem12.1 | . . 3 ⊢ 𝑇 = (𝑥 ∈ ℝ ↦ (abs‘((⌊‘(𝑥 + (1 / 2))) − 𝑥))) | |
29 | 28, 3, 1 | dnibndlem1 33824 | . 2 ⊢ (𝜑 → ((abs‘((𝑇‘𝐵) − (𝑇‘𝐴))) ≤ (abs‘(𝐵 − 𝐴)) ↔ (abs‘((abs‘((⌊‘(𝐵 + (1 / 2))) − 𝐵)) − (abs‘((⌊‘(𝐴 + (1 / 2))) − 𝐴)))) ≤ (abs‘(𝐵 − 𝐴)))) |
30 | 27, 29 | mpbird 259 | 1 ⊢ (𝜑 → (abs‘((𝑇‘𝐵) − (𝑇‘𝐴))) ≤ (abs‘(𝐵 − 𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 class class class wbr 5052 ↦ cmpt 5132 ‘cfv 6341 (class class class)co 7142 ℝcr 10522 1c1 10524 + caddc 10526 < clt 10661 ≤ cle 10662 − cmin 10856 / cdiv 11283 2c2 11679 ⌊cfl 13150 abscabs 14578 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 ax-cnex 10579 ax-resscn 10580 ax-1cn 10581 ax-icn 10582 ax-addcl 10583 ax-addrcl 10584 ax-mulcl 10585 ax-mulrcl 10586 ax-mulcom 10587 ax-addass 10588 ax-mulass 10589 ax-distr 10590 ax-i2m1 10591 ax-1ne0 10592 ax-1rid 10593 ax-rnegex 10594 ax-rrecex 10595 ax-cnre 10596 ax-pre-lttri 10597 ax-pre-lttrn 10598 ax-pre-ltadd 10599 ax-pre-mulgt0 10600 ax-pre-sup 10601 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3488 df-sbc 3764 df-csb 3872 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-iun 4907 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-rn 5552 df-res 5553 df-ima 5554 df-pred 6134 df-ord 6180 df-on 6181 df-lim 6182 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-f 6345 df-f1 6346 df-fo 6347 df-f1o 6348 df-fv 6349 df-riota 7100 df-ov 7145 df-oprab 7146 df-mpo 7147 df-om 7567 df-2nd 7676 df-wrecs 7933 df-recs 7994 df-rdg 8032 df-er 8275 df-en 8496 df-dom 8497 df-sdom 8498 df-sup 8892 df-inf 8893 df-pnf 10663 df-mnf 10664 df-xr 10665 df-ltxr 10666 df-le 10667 df-sub 10858 df-neg 10859 df-div 11284 df-nn 11625 df-2 11687 df-3 11688 df-n0 11885 df-z 11969 df-uz 12231 df-rp 12377 df-fl 13152 df-seq 13360 df-exp 13420 df-cj 14443 df-re 14444 df-im 14445 df-sqrt 14579 df-abs 14580 |
This theorem is referenced by: dnibndlem13 33836 |
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