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Mirrors > Home > MPE Home > Th. List > Mathboxes > dnibndlem4 | Structured version Visualization version GIF version |
Description: Lemma for dnibnd 33009. (Contributed by Asger C. Ipsen, 4-Apr-2021.) |
Ref | Expression |
---|---|
dnibndlem4 | ⊢ (𝐵 ∈ ℝ → 0 ≤ (𝐵 − ((⌊‘(𝐵 + (1 / 2))) − (1 / 2)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 22 | . . . . 5 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ) | |
2 | halfre 11579 | . . . . . 6 ⊢ (1 / 2) ∈ ℝ | |
3 | 2 | a1i 11 | . . . . 5 ⊢ (𝐵 ∈ ℝ → (1 / 2) ∈ ℝ) |
4 | 1, 3 | readdcld 10393 | . . . 4 ⊢ (𝐵 ∈ ℝ → (𝐵 + (1 / 2)) ∈ ℝ) |
5 | flle 12902 | . . . 4 ⊢ ((𝐵 + (1 / 2)) ∈ ℝ → (⌊‘(𝐵 + (1 / 2))) ≤ (𝐵 + (1 / 2))) | |
6 | 4, 5 | syl 17 | . . 3 ⊢ (𝐵 ∈ ℝ → (⌊‘(𝐵 + (1 / 2))) ≤ (𝐵 + (1 / 2))) |
7 | reflcl 12899 | . . . . 5 ⊢ ((𝐵 + (1 / 2)) ∈ ℝ → (⌊‘(𝐵 + (1 / 2))) ∈ ℝ) | |
8 | 4, 7 | syl 17 | . . . 4 ⊢ (𝐵 ∈ ℝ → (⌊‘(𝐵 + (1 / 2))) ∈ ℝ) |
9 | 8, 3, 1 | lesubaddd 10956 | . . 3 ⊢ (𝐵 ∈ ℝ → (((⌊‘(𝐵 + (1 / 2))) − (1 / 2)) ≤ 𝐵 ↔ (⌊‘(𝐵 + (1 / 2))) ≤ (𝐵 + (1 / 2)))) |
10 | 6, 9 | mpbird 249 | . 2 ⊢ (𝐵 ∈ ℝ → ((⌊‘(𝐵 + (1 / 2))) − (1 / 2)) ≤ 𝐵) |
11 | 8, 3 | jca 507 | . . . 4 ⊢ (𝐵 ∈ ℝ → ((⌊‘(𝐵 + (1 / 2))) ∈ ℝ ∧ (1 / 2) ∈ ℝ)) |
12 | resubcl 10673 | . . . 4 ⊢ (((⌊‘(𝐵 + (1 / 2))) ∈ ℝ ∧ (1 / 2) ∈ ℝ) → ((⌊‘(𝐵 + (1 / 2))) − (1 / 2)) ∈ ℝ) | |
13 | 11, 12 | syl 17 | . . 3 ⊢ (𝐵 ∈ ℝ → ((⌊‘(𝐵 + (1 / 2))) − (1 / 2)) ∈ ℝ) |
14 | 1, 13 | subge0d 10949 | . 2 ⊢ (𝐵 ∈ ℝ → (0 ≤ (𝐵 − ((⌊‘(𝐵 + (1 / 2))) − (1 / 2))) ↔ ((⌊‘(𝐵 + (1 / 2))) − (1 / 2)) ≤ 𝐵)) |
15 | 10, 14 | mpbird 249 | 1 ⊢ (𝐵 ∈ ℝ → 0 ≤ (𝐵 − ((⌊‘(𝐵 + (1 / 2))) − (1 / 2)))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 386 ∈ wcel 2164 class class class wbr 4875 ‘cfv 6127 (class class class)co 6910 ℝcr 10258 0cc0 10259 1c1 10260 + caddc 10262 ≤ cle 10399 − cmin 10592 / cdiv 11016 2c2 11413 ⌊cfl 12893 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1894 ax-4 1908 ax-5 2009 ax-6 2075 ax-7 2112 ax-8 2166 ax-9 2173 ax-10 2192 ax-11 2207 ax-12 2220 ax-13 2389 ax-ext 2803 ax-sep 5007 ax-nul 5015 ax-pow 5067 ax-pr 5129 ax-un 7214 ax-cnex 10315 ax-resscn 10316 ax-1cn 10317 ax-icn 10318 ax-addcl 10319 ax-addrcl 10320 ax-mulcl 10321 ax-mulrcl 10322 ax-mulcom 10323 ax-addass 10324 ax-mulass 10325 ax-distr 10326 ax-i2m1 10327 ax-1ne0 10328 ax-1rid 10329 ax-rnegex 10330 ax-rrecex 10331 ax-cnre 10332 ax-pre-lttri 10333 ax-pre-lttrn 10334 ax-pre-ltadd 10335 ax-pre-mulgt0 10336 ax-pre-sup 10337 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 879 df-3or 1112 df-3an 1113 df-tru 1660 df-ex 1879 df-nf 1883 df-sb 2068 df-mo 2605 df-eu 2640 df-clab 2812 df-cleq 2818 df-clel 2821 df-nfc 2958 df-ne 3000 df-nel 3103 df-ral 3122 df-rex 3123 df-reu 3124 df-rmo 3125 df-rab 3126 df-v 3416 df-sbc 3663 df-csb 3758 df-dif 3801 df-un 3803 df-in 3805 df-ss 3812 df-pss 3814 df-nul 4147 df-if 4309 df-pw 4382 df-sn 4400 df-pr 4402 df-tp 4404 df-op 4406 df-uni 4661 df-iun 4744 df-br 4876 df-opab 4938 df-mpt 4955 df-tr 4978 df-id 5252 df-eprel 5257 df-po 5265 df-so 5266 df-fr 5305 df-we 5307 df-xp 5352 df-rel 5353 df-cnv 5354 df-co 5355 df-dm 5356 df-rn 5357 df-res 5358 df-ima 5359 df-pred 5924 df-ord 5970 df-on 5971 df-lim 5972 df-suc 5973 df-iota 6090 df-fun 6129 df-fn 6130 df-f 6131 df-f1 6132 df-fo 6133 df-f1o 6134 df-fv 6135 df-riota 6871 df-ov 6913 df-oprab 6914 df-mpt2 6915 df-om 7332 df-wrecs 7677 df-recs 7739 df-rdg 7777 df-er 8014 df-en 8229 df-dom 8230 df-sdom 8231 df-sup 8623 df-inf 8624 df-pnf 10400 df-mnf 10401 df-xr 10402 df-ltxr 10403 df-le 10404 df-sub 10594 df-neg 10595 df-div 11017 df-nn 11358 df-2 11421 df-n0 11626 df-z 11712 df-uz 11976 df-fl 12895 |
This theorem is referenced by: dnibndlem9 33004 |
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