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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 12008 | . . 3 ⊢ (1 / 1) = 1 | |
| 2 | 1lt2 12516 | . . 3 ⊢ 1 < 2 | |
| 3 | 1, 2 | eqbrtri 5126 | . 2 ⊢ (1 / 1) < 2 |
| 4 | 1re 11309 | . . 3 ⊢ 1 ∈ ℝ | |
| 5 | 2re 12418 | . . 3 ⊢ 2 ∈ ℝ | |
| 6 | 0lt1 11839 | . . 3 ⊢ 0 < 1 | |
| 7 | 2pos 12448 | . . 3 ⊢ 0 < 2 | |
| 8 | 4, 4, 5, 6, 7 | ltdiv23ii 12245 | . 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 7421 1c1 11202 < clt 11344 / cdiv 11974 2c2 12398 |
| 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 7752 ax-resscn 11258 ax-1cn 11259 ax-icn 11260 ax-addcl 11261 ax-addrcl 11262 ax-mulcl 11263 ax-mulrcl 11264 ax-mulcom 11265 ax-addass 11266 ax-mulass 11267 ax-distr 11268 ax-i2m1 11269 ax-1ne0 11270 ax-1rid 11271 ax-rnegex 11272 ax-rrecex 11273 ax-cnre 11274 ax-pre-lttri 11275 ax-pre-lttrn 11276 ax-pre-ltadd 11277 ax-pre-mulgt0 11278 |
| 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 3900 df-un 3902 df-in 3904 df-ss 3915 df-pss 4035 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 6305 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6495 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-riota 7378 df-ov 7424 df-oprab 7425 df-mpo 7426 df-om 7879 df-2nd 8003 df-frecs 8300 df-wrecs 8331 df-recs 8380 df-rdg 8419 df-er 8718 df-en 8975 df-dom 8976 df-sdom 8977 df-pnf 11346 df-mnf 11347 df-xr 11348 df-ltxr 11349 df-le 11350 df-sub 11544 df-neg 11545 df-div 11975 df-nn 12337 df-2 12406 |
| This theorem is used by: 2tnp1ge0ge0 13970 absrdbnd 15510 geo2sum 16043 geo2lim 16045 geoihalfsum 16052 efcllem 16244 rpnnen2lem12 16394 ltoddhalfle 16532 halfleoddlt 16533 bitsp1o 16604 elii1 25257 htpycc 25302 pcoval1 25335 pco1 25337 pcocn 25339 pcohtpylem 25341 pcopt 25344 pcopt2 25345 pcoass 25346 pcorevlem 25348 iscmet3lem3 25612 mbfi1fseqlem6 26042 itg2monolem3 26074 aaliou3lem3 26672 cxpcn3lem 27076 lgamgulmlem2 27358 lgsquadlem2 27709 chtppilim 27803 dnizeq0 37342 dnibndlem12 37356 knoppcnlem4 37363 cnndvlem1 37404 iccioo01 38252 cntotbnd 38732 halffl 46313 sumnnodd 46643 stoweidlem5 47016 stoweidlem14 47025 stoweidlem28 47039 dirkertrigeqlem3 47111 dirkercncflem1 47114 dirkercncflem2 47115 ceilhalf1 48409 zofldiv2ALTV 48761 zofldiv2 49644 sepfsepc 50037 |
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