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| Mirrors > Home > ILE Home > Th. List > 2tnp1ge0ge0 | Unicode version | ||
| Description: Two times an integer plus one is not negative iff the integer is not negative. (Contributed by AV, 19-Jun-2021.) |
| Ref | Expression |
|---|---|
| 2tnp1ge0ge0 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2z 9568 |
. . . . . . 7
| |
| 2 | 1 | a1i 9 |
. . . . . 6
|
| 3 | id 19 |
. . . . . 6
| |
| 4 | 2, 3 | zmulcld 9669 |
. . . . 5
|
| 5 | 4 | peano2zd 9666 |
. . . 4
|
| 6 | 5 | zred 9663 |
. . 3
|
| 7 | 2re 9272 |
. . . 4
| |
| 8 | 7 | a1i 9 |
. . 3
|
| 9 | 2pos 9293 |
. . . 4
| |
| 10 | 9 | a1i 9 |
. . 3
|
| 11 | ge0div 9110 |
. . 3
| |
| 12 | 6, 8, 10, 11 | syl3anc 1274 |
. 2
|
| 13 | 4 | zcnd 9664 |
. . . . 5
|
| 14 | 1cnd 8255 |
. . . . 5
| |
| 15 | 2cn 9273 |
. . . . . . 7
| |
| 16 | 2ap0 9295 |
. . . . . . 7
| |
| 17 | 15, 16 | pm3.2i 272 |
. . . . . 6
|
| 18 | 17 | a1i 9 |
. . . . 5
|
| 19 | divdirap 8936 |
. . . . 5
| |
| 20 | 13, 14, 18, 19 | syl3anc 1274 |
. . . 4
|
| 21 | zcn 9545 |
. . . . . 6
| |
| 22 | 2cnd 9275 |
. . . . . 6
| |
| 23 | 16 | a1i 9 |
. . . . . 6
|
| 24 | 21, 22, 23 | divcanap3d 9034 |
. . . . 5
|
| 25 | 24 | oveq1d 6043 |
. . . 4
|
| 26 | 20, 25 | eqtrd 2264 |
. . 3
|
| 27 | 26 | breq2d 4105 |
. 2
|
| 28 | zre 9544 |
. . . 4
| |
| 29 | halfre 9416 |
. . . . 5
| |
| 30 | 29 | a1i 9 |
. . . 4
|
| 31 | 28, 30 | readdcld 8268 |
. . 3
|
| 32 | halfge0 9419 |
. . . 4
| |
| 33 | 28, 30 | addge01d 8772 |
. . . 4
|
| 34 | 32, 33 | mpbii 148 |
. . 3
|
| 35 | 1red 8254 |
. . . 4
| |
| 36 | halflt1 9420 |
. . . . 5
| |
| 37 | 36 | a1i 9 |
. . . 4
|
| 38 | 30, 35, 28, 37 | ltadd2dd 8661 |
. . 3
|
| 39 | btwnzge0 10623 |
. . 3
| |
| 40 | 31, 3, 34, 38, 39 | syl22anc 1275 |
. 2
|
| 41 | 12, 27, 40 | 3bitrd 214 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8183 ax-resscn 8184 ax-1cn 8185 ax-1re 8186 ax-icn 8187 ax-addcl 8188 ax-addrcl 8189 ax-mulcl 8190 ax-mulrcl 8191 ax-addcom 8192 ax-mulcom 8193 ax-addass 8194 ax-mulass 8195 ax-distr 8196 ax-i2m1 8197 ax-0lt1 8198 ax-1rid 8199 ax-0id 8200 ax-rnegex 8201 ax-precex 8202 ax-cnre 8203 ax-pre-ltirr 8204 ax-pre-ltwlin 8205 ax-pre-lttrn 8206 ax-pre-apti 8207 ax-pre-ltadd 8208 ax-pre-mulgt0 8209 ax-pre-mulext 8210 |
| This theorem depends on definitions: df-bi 117 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-reu 2518 df-rmo 2519 df-rab 2520 df-v 2805 df-sbc 3033 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-br 4094 df-opab 4156 df-id 4396 df-po 4399 df-iso 4400 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-iota 5293 df-fun 5335 df-fv 5341 df-riota 5981 df-ov 6031 df-oprab 6032 df-mpo 6033 df-pnf 8275 df-mnf 8276 df-xr 8277 df-ltxr 8278 df-le 8279 df-sub 8411 df-neg 8412 df-reap 8814 df-ap 8821 df-div 8912 df-inn 9203 df-2 9261 df-n0 9462 df-z 9541 |
| This theorem is referenced by: oddnn02np1 12521 |
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