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Mirrors > Home > MPE Home > Th. List > fllelt | Structured version Visualization version GIF version |
Description: A basic property of the floor (greatest integer) function. (Contributed by NM, 15-Nov-2004.) (Revised by Mario Carneiro, 2-Nov-2013.) |
Ref | Expression |
---|---|
fllelt | ⊢ (𝐴 ∈ ℝ → ((⌊‘𝐴) ≤ 𝐴 ∧ 𝐴 < ((⌊‘𝐴) + 1))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | flval 13503 | . . 3 ⊢ (𝐴 ∈ ℝ → (⌊‘𝐴) = (℩𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))) | |
2 | 1 | eqcomd 2744 | . 2 ⊢ (𝐴 ∈ ℝ → (℩𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) = (⌊‘𝐴)) |
3 | flcl 13504 | . . 3 ⊢ (𝐴 ∈ ℝ → (⌊‘𝐴) ∈ ℤ) | |
4 | rebtwnz 12676 | . . 3 ⊢ (𝐴 ∈ ℝ → ∃!𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) | |
5 | breq1 5078 | . . . . 5 ⊢ (𝑥 = (⌊‘𝐴) → (𝑥 ≤ 𝐴 ↔ (⌊‘𝐴) ≤ 𝐴)) | |
6 | oveq1 7276 | . . . . . 6 ⊢ (𝑥 = (⌊‘𝐴) → (𝑥 + 1) = ((⌊‘𝐴) + 1)) | |
7 | 6 | breq2d 5087 | . . . . 5 ⊢ (𝑥 = (⌊‘𝐴) → (𝐴 < (𝑥 + 1) ↔ 𝐴 < ((⌊‘𝐴) + 1))) |
8 | 5, 7 | anbi12d 631 | . . . 4 ⊢ (𝑥 = (⌊‘𝐴) → ((𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)) ↔ ((⌊‘𝐴) ≤ 𝐴 ∧ 𝐴 < ((⌊‘𝐴) + 1)))) |
9 | 8 | riota2 7252 | . . 3 ⊢ (((⌊‘𝐴) ∈ ℤ ∧ ∃!𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) → (((⌊‘𝐴) ≤ 𝐴 ∧ 𝐴 < ((⌊‘𝐴) + 1)) ↔ (℩𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) = (⌊‘𝐴))) |
10 | 3, 4, 9 | syl2anc 584 | . 2 ⊢ (𝐴 ∈ ℝ → (((⌊‘𝐴) ≤ 𝐴 ∧ 𝐴 < ((⌊‘𝐴) + 1)) ↔ (℩𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) = (⌊‘𝐴))) |
11 | 2, 10 | mpbird 256 | 1 ⊢ (𝐴 ∈ ℝ → ((⌊‘𝐴) ≤ 𝐴 ∧ 𝐴 < ((⌊‘𝐴) + 1))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1539 ∈ wcel 2106 ∃!wreu 3066 class class class wbr 5075 ‘cfv 6428 ℩crio 7225 (class class class)co 7269 ℝcr 10859 1c1 10861 + caddc 10863 < clt 10998 ≤ cle 10999 ℤcz 12308 ⌊cfl 13499 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7580 ax-cnex 10916 ax-resscn 10917 ax-1cn 10918 ax-icn 10919 ax-addcl 10920 ax-addrcl 10921 ax-mulcl 10922 ax-mulrcl 10923 ax-mulcom 10924 ax-addass 10925 ax-mulass 10926 ax-distr 10927 ax-i2m1 10928 ax-1ne0 10929 ax-1rid 10930 ax-rnegex 10931 ax-rrecex 10932 ax-cnre 10933 ax-pre-lttri 10934 ax-pre-lttrn 10935 ax-pre-ltadd 10936 ax-pre-mulgt0 10937 ax-pre-sup 10938 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3433 df-sbc 3718 df-csb 3834 df-dif 3891 df-un 3893 df-in 3895 df-ss 3905 df-pss 3907 df-nul 4259 df-if 4462 df-pw 4537 df-sn 4564 df-pr 4566 df-op 4570 df-uni 4842 df-iun 4928 df-br 5076 df-opab 5138 df-mpt 5159 df-tr 5193 df-id 5486 df-eprel 5492 df-po 5500 df-so 5501 df-fr 5541 df-we 5543 df-xp 5592 df-rel 5593 df-cnv 5594 df-co 5595 df-dm 5596 df-rn 5597 df-res 5598 df-ima 5599 df-pred 6197 df-ord 6264 df-on 6265 df-lim 6266 df-suc 6267 df-iota 6386 df-fun 6430 df-fn 6431 df-f 6432 df-f1 6433 df-fo 6434 df-f1o 6435 df-fv 6436 df-riota 7226 df-ov 7272 df-oprab 7273 df-mpo 7274 df-om 7705 df-2nd 7823 df-frecs 8086 df-wrecs 8117 df-recs 8191 df-rdg 8230 df-er 8487 df-en 8723 df-dom 8724 df-sdom 8725 df-sup 9190 df-inf 9191 df-pnf 11000 df-mnf 11001 df-xr 11002 df-ltxr 11003 df-le 11004 df-sub 11196 df-neg 11197 df-nn 11963 df-n0 12223 df-z 12309 df-uz 12572 df-fl 13501 |
This theorem is referenced by: flle 13508 flltp1 13509 flltnz 13520 fldivle 13540 prmreclem3 16608 opnmbllem 24754 gausslemma2dlem3 26505 dya2icoseg 32231 opnmbllem0 35800 ioodvbdlimc1lem2 43433 ioodvbdlimc2lem 43435 dirkercncflem4 43607 |
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