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Mirrors > Home > ILE Home > Th. List > ceiqle | GIF version |
Description: The ceiling of a real number is the smallest integer greater than or equal to it. (Contributed by Jim Kingdon, 11-Oct-2021.) |
Ref | Expression |
---|---|
ceiqle | ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → -(⌊‘-𝐴) ≤ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ceiqcl 10242 | . . . . . 6 ⊢ (𝐴 ∈ ℚ → -(⌊‘-𝐴) ∈ ℤ) | |
2 | 1 | zred 9313 | . . . . 5 ⊢ (𝐴 ∈ ℚ → -(⌊‘-𝐴) ∈ ℝ) |
3 | peano2rem 8165 | . . . . 5 ⊢ (-(⌊‘-𝐴) ∈ ℝ → (-(⌊‘-𝐴) − 1) ∈ ℝ) | |
4 | 2, 3 | syl 14 | . . . 4 ⊢ (𝐴 ∈ ℚ → (-(⌊‘-𝐴) − 1) ∈ ℝ) |
5 | 4 | 3ad2ant1 1008 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) − 1) ∈ ℝ) |
6 | qre 9563 | . . . 4 ⊢ (𝐴 ∈ ℚ → 𝐴 ∈ ℝ) | |
7 | 6 | 3ad2ant1 1008 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → 𝐴 ∈ ℝ) |
8 | zre 9195 | . . . 4 ⊢ (𝐵 ∈ ℤ → 𝐵 ∈ ℝ) | |
9 | 8 | 3ad2ant2 1009 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → 𝐵 ∈ ℝ) |
10 | ceiqm1l 10246 | . . . 4 ⊢ (𝐴 ∈ ℚ → (-(⌊‘-𝐴) − 1) < 𝐴) | |
11 | 10 | 3ad2ant1 1008 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) − 1) < 𝐴) |
12 | simp3 989 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → 𝐴 ≤ 𝐵) | |
13 | 5, 7, 9, 11, 12 | ltletrd 8321 | . 2 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) − 1) < 𝐵) |
14 | zlem1lt 9247 | . . . 4 ⊢ ((-(⌊‘-𝐴) ∈ ℤ ∧ 𝐵 ∈ ℤ) → (-(⌊‘-𝐴) ≤ 𝐵 ↔ (-(⌊‘-𝐴) − 1) < 𝐵)) | |
15 | 1, 14 | sylan 281 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ) → (-(⌊‘-𝐴) ≤ 𝐵 ↔ (-(⌊‘-𝐴) − 1) < 𝐵)) |
16 | 15 | 3adant3 1007 | . 2 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) ≤ 𝐵 ↔ (-(⌊‘-𝐴) − 1) < 𝐵)) |
17 | 13, 16 | mpbird 166 | 1 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → -(⌊‘-𝐴) ≤ 𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 104 ∧ w3a 968 ∈ wcel 2136 class class class wbr 3982 ‘cfv 5188 (class class class)co 5842 ℝcr 7752 1c1 7754 < clt 7933 ≤ cle 7934 − cmin 8069 -cneg 8070 ℤcz 9191 ℚcq 9557 ⌊cfl 10203 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-mulrcl 7852 ax-addcom 7853 ax-mulcom 7854 ax-addass 7855 ax-mulass 7856 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-1rid 7860 ax-0id 7861 ax-rnegex 7862 ax-precex 7863 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 ax-pre-mulgt0 7870 ax-pre-mulext 7871 ax-arch 7872 |
This theorem depends on definitions: df-bi 116 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rmo 2452 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-id 4271 df-po 4274 df-iso 4275 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-reap 8473 df-ap 8480 df-div 8569 df-inn 8858 df-n0 9115 df-z 9192 df-q 9558 df-rp 9590 df-fl 10205 |
This theorem is referenced by: ceilqle 10249 |
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