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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 8171 | . . 3 ⊢ 1 ∈ ℝ | |
| 2 | 0lt1 8299 | . . 3 ⊢ 0 < 1 | |
| 3 | 1, 1, 2, 2 | addgt0ii 8664 | . 2 ⊢ 0 < (1 + 1) |
| 4 | df-2 9195 | . 2 ⊢ 2 = (1 + 1) | |
| 5 | 3, 4 | breqtrri 4113 | 1 ⊢ 0 < 2 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4086 (class class class)co 6013 0cc0 8025 1c1 8026 + caddc 8028 < clt 8207 2c2 9187 |
| 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 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-cnex 8116 ax-resscn 8117 ax-1cn 8118 ax-1re 8119 ax-icn 8120 ax-addcl 8121 ax-addrcl 8122 ax-mulcl 8123 ax-addcom 8125 ax-addass 8127 ax-i2m1 8130 ax-0lt1 8131 ax-0id 8133 ax-rnegex 8134 ax-pre-lttrn 8139 ax-pre-ltadd 8141 |
| 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 2802 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-xp 4729 df-iota 5284 df-fv 5332 df-ov 6016 df-pnf 8209 df-mnf 8210 df-ltxr 8212 df-2 9195 |
| This theorem is referenced by: 2ne0 9228 2ap0 9229 3pos 9230 halfgt0 9352 halflt1 9354 halfpos2 9367 halfnneg2 9369 nominpos 9375 avglt1 9376 avglt2 9377 nn0n0n1ge2b 9552 3halfnz 9570 2rp 9886 xleaddadd 10115 2tnp1ge0ge0 10554 mulp1mod1 10620 s3fv0g 11365 amgm2 11672 cos2bnd 12314 sin02gt0 12318 sincos2sgn 12320 sin4lt0 12321 epos 12335 oexpneg 12431 oddge22np1 12435 evennn02n 12436 nn0ehalf 12457 nno 12460 nn0oddm1d2 12463 nnoddm1d2 12464 flodddiv4t2lthalf 12493 sqrt2re 12728 sqrt2irrap 12745 slotsdifdsndx 13301 imasvalstrd 13346 cnfldstr 14565 bl2in 15120 pilem3 15500 pipos 15505 sinhalfpilem 15508 sincosq1lem 15542 sinq12gt0 15547 coseq00topi 15552 coseq0negpitopi 15553 tangtx 15555 sincos4thpi 15557 tan4thpi 15558 sincos6thpi 15559 cosordlem 15566 cos02pilt1 15568 gausslemma2dlem0c 15773 gausslemma2dlem1a 15780 gausslemma2dlem2 15784 gausslemma2dlem3 15785 lgseisenlem1 15792 lgseisenlem2 15793 lgseisenlem3 15794 lgsquadlem1 15799 lgsquadlem2 15800 2lgslem1a1 15808 2lgslem1a2 15809 2lgslem1c 15812 2lgslem3a1 15819 ex-fl 16271 |
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