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| Mirrors > Home > ILE Home > Th. List > 2pos | GIF version | ||
| Description: The number 2 is positive. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 2pos | ⊢ 0 < 2 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1re 8326 | . . 3 ⊢ 1 ∈ ℝ | |
| 2 | 0lt1 8455 | . . 3 ⊢ 0 < 1 | |
| 3 | 1, 1, 2, 2 | addgt0ii 8821 | . 2 ⊢ 0 < (1 + 1) |
| 4 | df-2 9366 | . 2 ⊢ 2 = (1 + 1) | |
| 5 | 3, 4 | breqtrri 4157 | 1 ⊢ 0 < 2 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: class class class wbr 4130 (class class class)co 6085 0cc0 8180 1c1 8181 + caddc 8183 < clt 8361 2c2 9358 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8271 ax-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-addcom 8280 ax-addass 8282 ax-i2m1 8285 ax-0lt1 8286 ax-0id 8288 ax-rnegex 8289 ax-pre-lttrn 8294 ax-pre-ltadd 8296 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-xp 4780 df-iota 5337 df-fv 5385 df-ov 6088 df-pnf 8363 df-mnf 8364 df-ltxr 8366 df-2 9366 |
| This theorem is used by: 2ne0 9399 2ap0 9400 3pos 9401 halfgt0 9525 halflt1 9527 halfpos2 9540 halfnneg2 9542 nominpos 9548 avglt1 9549 avglt2 9550 nn0n0n1ge2b 9730 3halfnz 9748 2rp 10070 xleaddadd 10300 2tnp1ge0ge0 10750 mulp1mod1 10816 s3fv0g 11578 amgm2 11900 cos2bnd 12545 sin02gt0 12549 sincos2sgn 12551 sin4lt0 12552 epos 12566 oexpneg 12662 oddge22np1 12666 evennn02n 12667 nn0ehalf 12688 nno 12691 nn0oddm1d2 12694 nnoddm1d2 12695 flodddiv4t2lthalf 12724 sqrt2re 12960 sqrt2irrap 12978 slotsdifdsndx 13630 imasvalstrd 13670 cnfldstr 14946 bl2in 15556 pilem3 15937 pipos 15942 sinhalfpilem 15945 sincosq1lem 15979 sinq12gt0 15984 coseq00topi 15989 coseq0negpitopi 15990 tangtx 15992 sincos4thpi 15994 tan4thpi 15995 sincos6thpi 15996 cosordlem 16003 cos02pilt1 16005 log2tlbndlog2 16142 ppiqfi 16164 ppiqltx 16203 ppiqub 16215 chtublem 16217 chtqub 16218 bcmono 16226 bpos1lem 16231 bposlem1 16233 bposlem2 16234 bposlem3 16235 bposlem4 16236 bposlem5 16237 gausslemma2dlem0c 16292 gausslemma2dlem1a 16299 gausslemma2dlem2 16303 gausslemma2dlem3 16304 lgseisenlem1 16311 lgseisenlem2 16312 lgseisenlem3 16313 lgsquadlem1 16318 lgsquadlem2 16319 2lgslem1a1 16327 2lgslem1a2 16328 2lgslem1c 16331 2lgslem3a1 16338 konigsberg 16856 ex-fl 16861 |
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