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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 8161 | . . 3 ⊢ 1 ∈ ℝ | |
| 2 | 0lt1 8289 | . . 3 ⊢ 0 < 1 | |
| 3 | 1, 1, 2, 2 | addgt0ii 8654 | . 2 ⊢ 0 < (1 + 1) |
| 4 | df-2 9185 | . 2 ⊢ 2 = (1 + 1) | |
| 5 | 3, 4 | breqtrri 4110 | 1 ⊢ 0 < 2 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4083 (class class class)co 6010 0cc0 8015 1c1 8016 + caddc 8018 < clt 8197 2c2 9177 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4259 ax-pr 4294 ax-un 4525 ax-setind 4630 ax-cnex 8106 ax-resscn 8107 ax-1cn 8108 ax-1re 8109 ax-icn 8110 ax-addcl 8111 ax-addrcl 8112 ax-mulcl 8113 ax-addcom 8115 ax-addass 8117 ax-i2m1 8120 ax-0lt1 8121 ax-0id 8123 ax-rnegex 8124 ax-pre-lttrn 8129 ax-pre-ltadd 8131 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-xp 4726 df-iota 5281 df-fv 5329 df-ov 6013 df-pnf 8199 df-mnf 8200 df-ltxr 8202 df-2 9185 |
| This theorem is referenced by: 2ne0 9218 2ap0 9219 3pos 9220 halfgt0 9342 halflt1 9344 halfpos2 9357 halfnneg2 9359 nominpos 9365 avglt1 9366 avglt2 9367 nn0n0n1ge2b 9542 3halfnz 9560 2rp 9871 xleaddadd 10100 2tnp1ge0ge0 10538 mulp1mod1 10604 s3fv0g 11344 amgm2 11650 cos2bnd 12292 sin02gt0 12296 sincos2sgn 12298 sin4lt0 12299 epos 12313 oexpneg 12409 oddge22np1 12413 evennn02n 12414 nn0ehalf 12435 nno 12438 nn0oddm1d2 12441 nnoddm1d2 12442 flodddiv4t2lthalf 12471 sqrt2re 12706 sqrt2irrap 12723 slotsdifdsndx 13279 imasvalstrd 13324 cnfldstr 14543 bl2in 15098 pilem3 15478 pipos 15483 sinhalfpilem 15486 sincosq1lem 15520 sinq12gt0 15525 coseq00topi 15530 coseq0negpitopi 15531 tangtx 15533 sincos4thpi 15535 tan4thpi 15536 sincos6thpi 15537 cosordlem 15544 cos02pilt1 15546 gausslemma2dlem0c 15751 gausslemma2dlem1a 15758 gausslemma2dlem2 15762 gausslemma2dlem3 15763 lgseisenlem1 15770 lgseisenlem2 15771 lgseisenlem3 15772 lgsquadlem1 15777 lgsquadlem2 15778 2lgslem1a1 15786 2lgslem1a2 15787 2lgslem1c 15790 2lgslem3a1 15797 ex-fl 16198 |
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