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| Mirrors > Home > ILE Home > Th. List > halfge0 | GIF version | ||
| Description: One-half is not negative. (Contributed by AV, 7-Jun-2020.) |
| Ref | Expression |
|---|---|
| halfge0 | ⊢ 0 ≤ (1 / 2) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0re 8279 | . 2 ⊢ 0 ∈ ℝ | |
| 2 | halfre 9456 | . 2 ⊢ (1 / 2) ∈ ℝ | |
| 3 | halfgt0 9458 | . 2 ⊢ 0 < (1 / 2) | |
| 4 | 1, 2, 3 | ltleii 8381 | 1 ⊢ 0 ≤ (1 / 2) |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4111 (class class class)co 6052 0cc0 8132 1c1 8133 ≤ cle 8314 / cdiv 8951 2c2 9293 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4230 ax-pow 4289 ax-pr 4324 ax-un 4556 ax-setind 4661 ax-cnex 8223 ax-resscn 8224 ax-1cn 8225 ax-1re 8226 ax-icn 8227 ax-addcl 8228 ax-addrcl 8229 ax-mulcl 8230 ax-mulrcl 8231 ax-addcom 8232 ax-mulcom 8233 ax-addass 8234 ax-mulass 8235 ax-distr 8236 ax-i2m1 8237 ax-0lt1 8238 ax-1rid 8239 ax-0id 8240 ax-rnegex 8241 ax-precex 8242 ax-cnre 8243 ax-pre-ltirr 8244 ax-pre-ltwlin 8245 ax-pre-lttrn 8246 ax-pre-apti 8247 ax-pre-ltadd 8248 ax-pre-mulgt0 8249 ax-pre-mulext 8250 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-reu 2529 df-rmo 2530 df-rab 2531 df-v 2817 df-sbc 3045 df-dif 3215 df-un 3217 df-in 3219 df-ss 3226 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-br 4112 df-opab 4174 df-id 4416 df-po 4419 df-iso 4420 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-iota 5314 df-fun 5356 df-fv 5362 df-riota 6005 df-ov 6055 df-oprab 6056 df-mpo 6057 df-pnf 8315 df-mnf 8316 df-xr 8317 df-ltxr 8318 df-le 8319 df-sub 8451 df-neg 8452 df-reap 8854 df-ap 8861 df-div 8952 df-2 9301 |
| This theorem is referenced by: 2tnp1ge0ge0 10668 geo2lim 12210 geoihalfsum 12216 bitsp1o 12647 gausslemma2dlem1a 15980 trilpolemisumle 16871 |
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