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Mirrors > Home > MPE Home > Th. List > ico01fl0 | Structured version Visualization version GIF version |
Description: The floor of a real number in [0, 1) is 0. Remark: may shorten the proof of modid 13263 or a version of it where the antecedent is membership in an interval. (Contributed by BJ, 29-Jun-2019.) |
Ref | Expression |
---|---|
ico01fl0 | ⊢ (𝐴 ∈ (0[,)1) → (⌊‘𝐴) = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0re 10642 | . . . 4 ⊢ 0 ∈ ℝ | |
2 | 1xr 10699 | . . . 4 ⊢ 1 ∈ ℝ* | |
3 | icossre 12816 | . . . 4 ⊢ ((0 ∈ ℝ ∧ 1 ∈ ℝ*) → (0[,)1) ⊆ ℝ) | |
4 | 1, 2, 3 | mp2an 690 | . . 3 ⊢ (0[,)1) ⊆ ℝ |
5 | 4 | sseli 3962 | . 2 ⊢ (𝐴 ∈ (0[,)1) → 𝐴 ∈ ℝ) |
6 | 0xr 10687 | . . . 4 ⊢ 0 ∈ ℝ* | |
7 | elico1 12780 | . . . 4 ⊢ ((0 ∈ ℝ* ∧ 1 ∈ ℝ*) → (𝐴 ∈ (0[,)1) ↔ (𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴 ∧ 𝐴 < 1))) | |
8 | 6, 2, 7 | mp2an 690 | . . 3 ⊢ (𝐴 ∈ (0[,)1) ↔ (𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴 ∧ 𝐴 < 1)) |
9 | 8 | simp2bi 1142 | . 2 ⊢ (𝐴 ∈ (0[,)1) → 0 ≤ 𝐴) |
10 | 8 | simp3bi 1143 | . 2 ⊢ (𝐴 ∈ (0[,)1) → 𝐴 < 1) |
11 | recn 10626 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
12 | 11 | addid2d 10840 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (0 + 𝐴) = 𝐴) |
13 | 12 | fveqeq2d 6677 | . . . 4 ⊢ (𝐴 ∈ ℝ → ((⌊‘(0 + 𝐴)) = 0 ↔ (⌊‘𝐴) = 0)) |
14 | 0z 11991 | . . . . 5 ⊢ 0 ∈ ℤ | |
15 | flbi2 13186 | . . . . 5 ⊢ ((0 ∈ ℤ ∧ 𝐴 ∈ ℝ) → ((⌊‘(0 + 𝐴)) = 0 ↔ (0 ≤ 𝐴 ∧ 𝐴 < 1))) | |
16 | 14, 15 | mpan 688 | . . . 4 ⊢ (𝐴 ∈ ℝ → ((⌊‘(0 + 𝐴)) = 0 ↔ (0 ≤ 𝐴 ∧ 𝐴 < 1))) |
17 | 13, 16 | bitr3d 283 | . . 3 ⊢ (𝐴 ∈ ℝ → ((⌊‘𝐴) = 0 ↔ (0 ≤ 𝐴 ∧ 𝐴 < 1))) |
18 | 17 | biimpar 480 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ (0 ≤ 𝐴 ∧ 𝐴 < 1)) → (⌊‘𝐴) = 0) |
19 | 5, 9, 10, 18 | syl12anc 834 | 1 ⊢ (𝐴 ∈ (0[,)1) → (⌊‘𝐴) = 0) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ⊆ wss 3935 class class class wbr 5065 ‘cfv 6354 (class class class)co 7155 ℝcr 10535 0cc0 10536 1c1 10537 + caddc 10539 ℝ*cxr 10673 < clt 10674 ≤ cle 10675 ℤcz 11980 [,)cico 12739 ⌊cfl 13159 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 ax-cnex 10592 ax-resscn 10593 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-addrcl 10597 ax-mulcl 10598 ax-mulrcl 10599 ax-mulcom 10600 ax-addass 10601 ax-mulass 10602 ax-distr 10603 ax-i2m1 10604 ax-1ne0 10605 ax-1rid 10606 ax-rnegex 10607 ax-rrecex 10608 ax-cnre 10609 ax-pre-lttri 10610 ax-pre-lttrn 10611 ax-pre-ltadd 10612 ax-pre-mulgt0 10613 ax-pre-sup 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 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 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4838 df-iun 4920 df-br 5066 df-opab 5128 df-mpt 5146 df-tr 5172 df-id 5459 df-eprel 5464 df-po 5473 df-so 5474 df-fr 5513 df-we 5515 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-pred 6147 df-ord 6193 df-on 6194 df-lim 6195 df-suc 6196 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-om 7580 df-wrecs 7946 df-recs 8007 df-rdg 8045 df-er 8288 df-en 8509 df-dom 8510 df-sdom 8511 df-sup 8905 df-inf 8906 df-pnf 10676 df-mnf 10677 df-xr 10678 df-ltxr 10679 df-le 10680 df-sub 10871 df-neg 10872 df-nn 11638 df-n0 11897 df-z 11981 df-uz 12243 df-ico 12743 df-fl 13161 |
This theorem is referenced by: dnizeq0 33814 dignnld 44662 digexp 44666 |
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