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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 9601 | . . . . . 6 ⊢ (𝐴 ∈ ℚ → -(⌊‘-𝐴) ∈ ℤ) | |
2 | 1 | zred 8762 | . . . . 5 ⊢ (𝐴 ∈ ℚ → -(⌊‘-𝐴) ∈ ℝ) |
3 | peano2rem 7650 | . . . . 5 ⊢ (-(⌊‘-𝐴) ∈ ℝ → (-(⌊‘-𝐴) − 1) ∈ ℝ) | |
4 | 2, 3 | syl 14 | . . . 4 ⊢ (𝐴 ∈ ℚ → (-(⌊‘-𝐴) − 1) ∈ ℝ) |
5 | 4 | 3ad2ant1 960 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) − 1) ∈ ℝ) |
6 | qre 9003 | . . . 4 ⊢ (𝐴 ∈ ℚ → 𝐴 ∈ ℝ) | |
7 | 6 | 3ad2ant1 960 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → 𝐴 ∈ ℝ) |
8 | zre 8648 | . . . 4 ⊢ (𝐵 ∈ ℤ → 𝐵 ∈ ℝ) | |
9 | 8 | 3ad2ant2 961 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → 𝐵 ∈ ℝ) |
10 | ceiqm1l 9605 | . . . 4 ⊢ (𝐴 ∈ ℚ → (-(⌊‘-𝐴) − 1) < 𝐴) | |
11 | 10 | 3ad2ant1 960 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) − 1) < 𝐴) |
12 | simp3 941 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → 𝐴 ≤ 𝐵) | |
13 | 5, 7, 9, 11, 12 | ltletrd 7802 | . 2 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) − 1) < 𝐵) |
14 | zlem1lt 8700 | . . . 4 ⊢ ((-(⌊‘-𝐴) ∈ ℤ ∧ 𝐵 ∈ ℤ) → (-(⌊‘-𝐴) ≤ 𝐵 ↔ (-(⌊‘-𝐴) − 1) < 𝐵)) | |
15 | 1, 14 | sylan 277 | . . 3 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ) → (-(⌊‘-𝐴) ≤ 𝐵 ↔ (-(⌊‘-𝐴) − 1) < 𝐵)) |
16 | 15 | 3adant3 959 | . 2 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → (-(⌊‘-𝐴) ≤ 𝐵 ↔ (-(⌊‘-𝐴) − 1) < 𝐵)) |
17 | 13, 16 | mpbird 165 | 1 ⊢ ((𝐴 ∈ ℚ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ≤ 𝐵) → -(⌊‘-𝐴) ≤ 𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ↔ wb 103 ∧ w3a 920 ∈ wcel 1434 class class class wbr 3811 ‘cfv 4967 (class class class)co 5589 ℝcr 7250 1c1 7252 < clt 7423 ≤ cle 7424 − cmin 7554 -cneg 7555 ℤcz 8644 ℚcq 8997 ⌊cfl 9562 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 577 ax-in2 578 ax-io 663 ax-5 1377 ax-7 1378 ax-gen 1379 ax-ie1 1423 ax-ie2 1424 ax-8 1436 ax-10 1437 ax-11 1438 ax-i12 1439 ax-bndl 1440 ax-4 1441 ax-13 1445 ax-14 1446 ax-17 1460 ax-i9 1464 ax-ial 1468 ax-i5r 1469 ax-ext 2065 ax-sep 3922 ax-pow 3974 ax-pr 3999 ax-un 4223 ax-setind 4315 ax-cnex 7337 ax-resscn 7338 ax-1cn 7339 ax-1re 7340 ax-icn 7341 ax-addcl 7342 ax-addrcl 7343 ax-mulcl 7344 ax-mulrcl 7345 ax-addcom 7346 ax-mulcom 7347 ax-addass 7348 ax-mulass 7349 ax-distr 7350 ax-i2m1 7351 ax-0lt1 7352 ax-1rid 7353 ax-0id 7354 ax-rnegex 7355 ax-precex 7356 ax-cnre 7357 ax-pre-ltirr 7358 ax-pre-ltwlin 7359 ax-pre-lttrn 7360 ax-pre-apti 7361 ax-pre-ltadd 7362 ax-pre-mulgt0 7363 ax-pre-mulext 7364 ax-arch 7365 |
This theorem depends on definitions: df-bi 115 df-3or 921 df-3an 922 df-tru 1288 df-fal 1291 df-nf 1391 df-sb 1688 df-eu 1946 df-mo 1947 df-clab 2070 df-cleq 2076 df-clel 2079 df-nfc 2212 df-ne 2250 df-nel 2345 df-ral 2358 df-rex 2359 df-reu 2360 df-rmo 2361 df-rab 2362 df-v 2614 df-sbc 2827 df-csb 2920 df-dif 2986 df-un 2988 df-in 2990 df-ss 2997 df-pw 3408 df-sn 3428 df-pr 3429 df-op 3431 df-uni 3628 df-int 3663 df-iun 3706 df-br 3812 df-opab 3866 df-mpt 3867 df-id 4083 df-po 4086 df-iso 4087 df-xp 4405 df-rel 4406 df-cnv 4407 df-co 4408 df-dm 4409 df-rn 4410 df-res 4411 df-ima 4412 df-iota 4932 df-fun 4969 df-fn 4970 df-f 4971 df-fv 4975 df-riota 5545 df-ov 5592 df-oprab 5593 df-mpt2 5594 df-1st 5844 df-2nd 5845 df-pnf 7425 df-mnf 7426 df-xr 7427 df-ltxr 7428 df-le 7429 df-sub 7556 df-neg 7557 df-reap 7950 df-ap 7957 df-div 8036 df-inn 8315 df-n0 8564 df-z 8645 df-q 8998 df-rp 9028 df-fl 9564 |
This theorem is referenced by: ceilqle 9608 |
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