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Mirrors > Home > ILE Home > Th. List > ceilqval | GIF version |
Description: The value of the ceiling function. (Contributed by Jim Kingdon, 10-Oct-2021.) |
Ref | Expression |
---|---|
ceilqval | ⊢ (𝐴 ∈ ℚ → (⌈‘𝐴) = -(⌊‘-𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | qre 9654 | . 2 ⊢ (𝐴 ∈ ℚ → 𝐴 ∈ ℝ) | |
2 | qnegcl 9665 | . . 3 ⊢ (𝐴 ∈ ℚ → -𝐴 ∈ ℚ) | |
3 | flqcl 10303 | . . . 4 ⊢ (-𝐴 ∈ ℚ → (⌊‘-𝐴) ∈ ℤ) | |
4 | 3 | znegcld 9406 | . . 3 ⊢ (-𝐴 ∈ ℚ → -(⌊‘-𝐴) ∈ ℤ) |
5 | 2, 4 | syl 14 | . 2 ⊢ (𝐴 ∈ ℚ → -(⌊‘-𝐴) ∈ ℤ) |
6 | negeq 8179 | . . . . 5 ⊢ (𝑥 = 𝐴 → -𝑥 = -𝐴) | |
7 | 6 | fveq2d 5538 | . . . 4 ⊢ (𝑥 = 𝐴 → (⌊‘-𝑥) = (⌊‘-𝐴)) |
8 | 7 | negeqd 8181 | . . 3 ⊢ (𝑥 = 𝐴 → -(⌊‘-𝑥) = -(⌊‘-𝐴)) |
9 | df-ceil 10301 | . . 3 ⊢ ⌈ = (𝑥 ∈ ℝ ↦ -(⌊‘-𝑥)) | |
10 | 8, 9 | fvmptg 5612 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ -(⌊‘-𝐴) ∈ ℤ) → (⌈‘𝐴) = -(⌊‘-𝐴)) |
11 | 1, 5, 10 | syl2anc 411 | 1 ⊢ (𝐴 ∈ ℚ → (⌈‘𝐴) = -(⌊‘-𝐴)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1364 ∈ wcel 2160 ‘cfv 5235 ℝcr 7839 -cneg 8158 ℤcz 9282 ℚcq 9648 ⌊cfl 10298 ⌈cceil 10299 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-sep 4136 ax-pow 4192 ax-pr 4227 ax-un 4451 ax-setind 4554 ax-cnex 7931 ax-resscn 7932 ax-1cn 7933 ax-1re 7934 ax-icn 7935 ax-addcl 7936 ax-addrcl 7937 ax-mulcl 7938 ax-mulrcl 7939 ax-addcom 7940 ax-mulcom 7941 ax-addass 7942 ax-mulass 7943 ax-distr 7944 ax-i2m1 7945 ax-0lt1 7946 ax-1rid 7947 ax-0id 7948 ax-rnegex 7949 ax-precex 7950 ax-cnre 7951 ax-pre-ltirr 7952 ax-pre-ltwlin 7953 ax-pre-lttrn 7954 ax-pre-apti 7955 ax-pre-ltadd 7956 ax-pre-mulgt0 7957 ax-pre-mulext 7958 ax-arch 7959 |
This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-ral 2473 df-rex 2474 df-reu 2475 df-rmo 2476 df-rab 2477 df-v 2754 df-sbc 2978 df-csb 3073 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-pw 3592 df-sn 3613 df-pr 3614 df-op 3616 df-uni 3825 df-int 3860 df-iun 3903 df-br 4019 df-opab 4080 df-mpt 4081 df-id 4311 df-po 4314 df-iso 4315 df-xp 4650 df-rel 4651 df-cnv 4652 df-co 4653 df-dm 4654 df-rn 4655 df-res 4656 df-ima 4657 df-iota 5196 df-fun 5237 df-fn 5238 df-f 5239 df-fv 5243 df-riota 5851 df-ov 5898 df-oprab 5899 df-mpo 5900 df-1st 6164 df-2nd 6165 df-pnf 8023 df-mnf 8024 df-xr 8025 df-ltxr 8026 df-le 8027 df-sub 8159 df-neg 8160 df-reap 8561 df-ap 8568 df-div 8659 df-inn 8949 df-n0 9206 df-z 9283 df-q 9649 df-rp 9683 df-fl 10300 df-ceil 10301 |
This theorem is referenced by: ceilqcl 10338 ceilqge 10340 ceilqm1lt 10342 ceilqle 10344 ceilid 10345 ex-ceil 14931 |
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