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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 10562 mulp1mod1 10628 s3fv0g 11376 amgm2 11683 cos2bnd 12326 sin02gt0 12330 sincos2sgn 12332 sin4lt0 12333 epos 12347 oexpneg 12443 oddge22np1 12447 evennn02n 12448 nn0ehalf 12469 nno 12472 nn0oddm1d2 12475 nnoddm1d2 12476 flodddiv4t2lthalf 12505 sqrt2re 12740 sqrt2irrap 12757 slotsdifdsndx 13313 imasvalstrd 13358 cnfldstr 14578 bl2in 15133 pilem3 15513 pipos 15518 sinhalfpilem 15521 sincosq1lem 15555 sinq12gt0 15560 coseq00topi 15565 coseq0negpitopi 15566 tangtx 15568 sincos4thpi 15570 tan4thpi 15571 sincos6thpi 15572 cosordlem 15579 cos02pilt1 15581 gausslemma2dlem0c 15786 gausslemma2dlem1a 15793 gausslemma2dlem2 15797 gausslemma2dlem3 15798 lgseisenlem1 15805 lgseisenlem2 15806 lgseisenlem3 15807 lgsquadlem1 15812 lgsquadlem2 15813 2lgslem1a1 15821 2lgslem1a2 15822 2lgslem1c 15825 2lgslem3a1 15832 ex-fl 16343 |
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