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Mirrors > Home > MPE Home > Th. List > Mathboxes > halffl | Structured version Visualization version GIF version |
Description: Floor of (1 / 2). (Contributed by Glauco Siliprandi, 11-Dec-2019.) |
Ref | Expression |
---|---|
halffl | ⊢ (⌊‘(1 / 2)) = 0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0re 10643 | . . 3 ⊢ 0 ∈ ℝ | |
2 | halfre 11852 | . . 3 ⊢ (1 / 2) ∈ ℝ | |
3 | halfgt0 11854 | . . 3 ⊢ 0 < (1 / 2) | |
4 | 1, 2, 3 | ltleii 10763 | . 2 ⊢ 0 ≤ (1 / 2) |
5 | halflt1 11856 | . . 3 ⊢ (1 / 2) < 1 | |
6 | 1e0p1 12141 | . . 3 ⊢ 1 = (0 + 1) | |
7 | 5, 6 | breqtri 5091 | . 2 ⊢ (1 / 2) < (0 + 1) |
8 | 0z 11993 | . . 3 ⊢ 0 ∈ ℤ | |
9 | flbi 13187 | . . 3 ⊢ (((1 / 2) ∈ ℝ ∧ 0 ∈ ℤ) → ((⌊‘(1 / 2)) = 0 ↔ (0 ≤ (1 / 2) ∧ (1 / 2) < (0 + 1)))) | |
10 | 2, 8, 9 | mp2an 690 | . 2 ⊢ ((⌊‘(1 / 2)) = 0 ↔ (0 ≤ (1 / 2) ∧ (1 / 2) < (0 + 1))) |
11 | 4, 7, 10 | mpbir2an 709 | 1 ⊢ (⌊‘(1 / 2)) = 0 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 = wceq 1537 ∈ wcel 2114 class class class wbr 5066 ‘cfv 6355 (class class class)co 7156 ℝcr 10536 0cc0 10537 1c1 10538 + caddc 10540 < clt 10675 ≤ cle 10676 / cdiv 11297 2c2 11693 ℤcz 11982 ⌊cfl 13161 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 ax-pre-sup 10615 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 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 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-sup 8906 df-inf 8907 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-div 11298 df-nn 11639 df-2 11701 df-n0 11899 df-z 11983 df-uz 12245 df-fl 13163 |
This theorem is referenced by: dirkertrigeqlem3 42405 |
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