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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 8332 | . . 3 ⊢ 1 ∈ ℝ | |
| 2 | 0lt1 8461 | . . 3 ⊢ 0 < 1 | |
| 3 | 1, 1, 2, 2 | addgt0ii 8827 | . 2 ⊢ 0 < (1 + 1) |
| 4 | df-2 9373 | . 2 ⊢ 2 = (1 + 1) | |
| 5 | 3, 4 | breqtrri 4158 | 1 ⊢ 0 < 2 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: class class class wbr 4131 (class class class)co 6088 0cc0 8186 1c1 8187 + caddc 8189 < clt 8367 2c2 9365 |
| 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 4251 ax-pow 4313 ax-pr 4348 ax-un 4580 ax-setind 4686 ax-cnex 8277 ax-resscn 8278 ax-1cn 8279 ax-1re 8280 ax-icn 8281 ax-addcl 8282 ax-addrcl 8283 ax-mulcl 8284 ax-addcom 8286 ax-addass 8288 ax-i2m1 8291 ax-0lt1 8292 ax-0id 8294 ax-rnegex 8295 ax-pre-lttrn 8300 ax-pre-ltadd 8302 |
| 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 4132 df-opab 4194 df-xp 4782 df-iota 5340 df-fv 5388 df-ov 6091 df-pnf 8369 df-mnf 8370 df-ltxr 8372 df-2 9373 |
| This theorem is used by: 2ne0 9406 2ap0 9407 3pos 9408 halfgt0 9532 halflt1 9534 halfpos2 9547 halfnneg2 9549 nominpos 9555 avglt1 9556 avglt2 9557 nn0n0n1ge2b 9735 3halfnz 9754 2rp 10076 xleaddadd 10306 2tnp1ge0ge0 10757 mulp1mod1 10823 s3fv0g 11585 amgm2 11907 cos2bnd 12552 sin02gt0 12556 sincos2sgn 12558 sin4lt0 12559 epos 12573 oexpneg 12669 oddge22np1 12673 evennn02n 12674 nn0ehalf 12695 nno 12698 nn0oddm1d2 12701 nnoddm1d2 12702 flodddiv4t2lthalf 12731 sqrt2re 12967 sqrt2irrap 12985 slotsdifdsndx 13638 imasvalstrd 13678 cnfldstr 15004 bl2in 15662 pilem3 16043 pipos 16048 sinhalfpilem 16051 sincosq1lem 16085 sinq12gt0 16090 coseq00topi 16095 coseq0negpitopi 16096 tangtx 16098 sincos4thpi 16100 tan4thpi 16101 sincos6thpi 16102 cosordlem 16110 cos02pilt1 16112 log2tlbndlog2 16253 ppiqfi 16275 ppiqltx 16314 ppiqub 16326 chtublem 16328 chtqub 16329 bcmono 16337 bpos1lem 16342 bposlem1 16344 bposlem2 16345 bposlem3 16346 bposlem4 16347 bposlem5 16348 bposlem6 16349 bposlem7 16350 gausslemma2dlem0c 16408 gausslemma2dlem1a 16415 gausslemma2dlem2 16419 gausslemma2dlem3 16420 lgseisenlem1 16427 lgseisenlem2 16428 lgseisenlem3 16429 lgsquadlem1 16434 lgsquadlem2 16435 2lgslem1a1 16443 2lgslem1a2 16444 2lgslem1c 16447 2lgslem3a1 16454 konigsberg 16972 ex-fl 16977 |
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