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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 8325 | . . 3 ⊢ 1 ∈ ℝ | |
| 2 | 0lt1 8453 | . . 3 ⊢ 0 < 1 | |
| 3 | 1, 1, 2, 2 | addgt0ii 8819 | . 2 ⊢ 0 < (1 + 1) |
| 4 | df-2 9364 | . 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 8179 1c1 8180 + caddc 8182 < clt 8360 2c2 9356 |
| 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 8270 ax-resscn 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-i2m1 8284 ax-0lt1 8285 ax-0id 8287 ax-rnegex 8288 ax-pre-lttrn 8293 ax-pre-ltadd 8295 |
| 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 8362 df-mnf 8363 df-ltxr 8365 df-2 9364 |
| This theorem is used by: 2ne0 9397 2ap0 9398 3pos 9399 halfgt0 9522 halflt1 9524 halfpos2 9537 halfnneg2 9539 nominpos 9545 avglt1 9546 avglt2 9547 nn0n0n1ge2b 9727 3halfnz 9745 2rp 10061 xleaddadd 10291 2tnp1ge0ge0 10738 mulp1mod1 10804 s3fv0g 11565 amgm2 11886 cos2bnd 12529 sin02gt0 12533 sincos2sgn 12535 sin4lt0 12536 epos 12550 oexpneg 12646 oddge22np1 12650 evennn02n 12651 nn0ehalf 12672 nno 12675 nn0oddm1d2 12678 nnoddm1d2 12679 flodddiv4t2lthalf 12708 sqrt2re 12943 sqrt2irrap 12960 slotsdifdsndx 13581 imasvalstrd 13621 cnfldstr 14897 bl2in 15506 pilem3 15887 pipos 15892 sinhalfpilem 15895 sincosq1lem 15929 sinq12gt0 15934 coseq00topi 15939 coseq0negpitopi 15940 tangtx 15942 sincos4thpi 15944 tan4thpi 15945 sincos6thpi 15946 cosordlem 15953 cos02pilt1 15955 log2tlbndlog2 16088 bcmono 16124 gausslemma2dlem0c 16182 gausslemma2dlem1a 16189 gausslemma2dlem2 16193 gausslemma2dlem3 16194 lgseisenlem1 16201 lgseisenlem2 16202 lgseisenlem3 16203 lgsquadlem1 16208 lgsquadlem2 16209 2lgslem1a1 16217 2lgslem1a2 16218 2lgslem1c 16221 2lgslem3a1 16228 konigsberg 16746 ex-fl 16751 |
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