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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 8178 | . . 3 ⊢ 1 ∈ ℝ | |
| 2 | 0lt1 8306 | . . 3 ⊢ 0 < 1 | |
| 3 | 1, 1, 2, 2 | addgt0ii 8671 | . 2 ⊢ 0 < (1 + 1) |
| 4 | df-2 9202 | . 2 ⊢ 2 = (1 + 1) | |
| 5 | 3, 4 | breqtrri 4115 | 1 ⊢ 0 < 2 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4088 (class class class)co 6018 0cc0 8032 1c1 8033 + caddc 8035 < clt 8214 2c2 9194 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-cnex 8123 ax-resscn 8124 ax-1cn 8125 ax-1re 8126 ax-icn 8127 ax-addcl 8128 ax-addrcl 8129 ax-mulcl 8130 ax-addcom 8132 ax-addass 8134 ax-i2m1 8137 ax-0lt1 8138 ax-0id 8140 ax-rnegex 8141 ax-pre-lttrn 8146 ax-pre-ltadd 8148 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-rab 2519 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-opab 4151 df-xp 4731 df-iota 5286 df-fv 5334 df-ov 6021 df-pnf 8216 df-mnf 8217 df-ltxr 8219 df-2 9202 |
| This theorem is referenced by: 2ne0 9235 2ap0 9236 3pos 9237 halfgt0 9359 halflt1 9361 halfpos2 9374 halfnneg2 9376 nominpos 9382 avglt1 9383 avglt2 9384 nn0n0n1ge2b 9559 3halfnz 9577 2rp 9893 xleaddadd 10122 2tnp1ge0ge0 10561 mulp1mod1 10627 s3fv0g 11372 amgm2 11679 cos2bnd 12322 sin02gt0 12326 sincos2sgn 12328 sin4lt0 12329 epos 12343 oexpneg 12439 oddge22np1 12443 evennn02n 12444 nn0ehalf 12465 nno 12468 nn0oddm1d2 12471 nnoddm1d2 12472 flodddiv4t2lthalf 12501 sqrt2re 12736 sqrt2irrap 12753 slotsdifdsndx 13309 imasvalstrd 13354 cnfldstr 14574 bl2in 15129 pilem3 15509 pipos 15514 sinhalfpilem 15517 sincosq1lem 15551 sinq12gt0 15556 coseq00topi 15561 coseq0negpitopi 15562 tangtx 15564 sincos4thpi 15566 tan4thpi 15567 sincos6thpi 15568 cosordlem 15575 cos02pilt1 15577 gausslemma2dlem0c 15782 gausslemma2dlem1a 15789 gausslemma2dlem2 15793 gausslemma2dlem3 15794 lgseisenlem1 15801 lgseisenlem2 15802 lgseisenlem3 15803 lgsquadlem1 15808 lgsquadlem2 15809 2lgslem1a1 15817 2lgslem1a2 15818 2lgslem1c 15821 2lgslem3a1 15828 ex-fl 16324 |
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