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| Mirrors > Home > MPE Home > Th. List > halflt1 | Structured version Visualization version GIF version | ||
| Description: One-half is less than one. (Contributed by NM, 24-Feb-2005.) |
| Ref | Expression |
|---|---|
| halflt1 | ⊢ (1 / 2) < 1 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1div1e1 11988 | . . 3 ⊢ (1 / 1) = 1 | |
| 2 | 1lt2 12496 | . . 3 ⊢ 1 < 2 | |
| 3 | 1, 2 | eqbrtri 5126 | . 2 ⊢ (1 / 1) < 2 |
| 4 | 1re 11289 | . . 3 ⊢ 1 ∈ ℝ | |
| 5 | 2re 12398 | . . 3 ⊢ 2 ∈ ℝ | |
| 6 | 0lt1 11819 | . . 3 ⊢ 0 < 1 | |
| 7 | 2pos 12428 | . . 3 ⊢ 0 < 2 | |
| 8 | 4, 4, 5, 6, 7 | ltdiv23ii 12225 | . 2 ⊢ ((1 / 1) < 2 ↔ (1 / 2) < 1) |
| 9 | 3, 8 | mpbi 233 | 1 ⊢ (1 / 2) < 1 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: class class class wbr 5103 (class class class)co 7412 1c1 11182 < clt 11324 / cdiv 11954 2c2 12378 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 ax-resscn 11238 ax-1cn 11239 ax-icn 11240 ax-addcl 11241 ax-addrcl 11242 ax-mulcl 11243 ax-mulrcl 11244 ax-mulcom 11245 ax-addass 11246 ax-mulass 11247 ax-distr 11248 ax-i2m1 11249 ax-1ne0 11250 ax-1rid 11251 ax-rnegex 11252 ax-rrecex 11253 ax-cnre 11254 ax-pre-lttri 11255 ax-pre-lttrn 11256 ax-pre-ltadd 11257 ax-pre-mulgt0 11258 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-riota 7369 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11524 df-neg 11525 df-div 11955 df-nn 12317 df-2 12386 |
| This theorem is used by: 2tnp1ge0ge0 13949 absrdbnd 15489 geo2sum 16022 geo2lim 16024 geoihalfsum 16031 efcllem 16223 rpnnen2lem12 16373 ltoddhalfle 16511 halfleoddlt 16512 bitsp1o 16583 elii1 25236 htpycc 25281 pcoval1 25314 pco1 25316 pcocn 25318 pcohtpylem 25320 pcopt 25323 pcopt2 25324 pcoass 25325 pcorevlem 25327 iscmet3lem3 25591 mbfi1fseqlem6 26021 itg2monolem3 26053 aaliou3lem3 26653 cxpcn3lem 27057 lgamgulmlem2 27339 lgsquadlem2 27690 chtppilim 27784 dnizeq0 37311 dnibndlem12 37325 knoppcnlem4 37332 cnndvlem1 37373 iccioo01 38218 cntotbnd 38698 halffl 46255 sumnnodd 46586 stoweidlem5 46959 stoweidlem14 46968 stoweidlem28 46982 dirkertrigeqlem3 47054 dirkercncflem1 47057 dirkercncflem2 47058 ceilhalf1 48352 zofldiv2ALTV 48704 zofldiv2 49587 sepfsepc 49980 |
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