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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 9497 |
. . . . . . 7
| |
| 2 | 1 | a1i 9 |
. . . . . 6
|
| 3 | id 19 |
. . . . . 6
| |
| 4 | 2, 3 | zmulcld 9598 |
. . . . 5
|
| 5 | 4 | peano2zd 9595 |
. . . 4
|
| 6 | 5 | zred 9592 |
. . 3
|
| 7 | 2re 9203 |
. . . 4
| |
| 8 | 7 | a1i 9 |
. . 3
|
| 9 | 2pos 9224 |
. . . 4
| |
| 10 | 9 | a1i 9 |
. . 3
|
| 11 | ge0div 9041 |
. . 3
| |
| 12 | 6, 8, 10, 11 | syl3anc 1271 |
. 2
|
| 13 | 4 | zcnd 9593 |
. . . . 5
|
| 14 | 1cnd 8185 |
. . . . 5
| |
| 15 | 2cn 9204 |
. . . . . . 7
| |
| 16 | 2ap0 9226 |
. . . . . . 7
| |
| 17 | 15, 16 | pm3.2i 272 |
. . . . . 6
|
| 18 | 17 | a1i 9 |
. . . . 5
|
| 19 | divdirap 8867 |
. . . . 5
| |
| 20 | 13, 14, 18, 19 | syl3anc 1271 |
. . . 4
|
| 21 | zcn 9474 |
. . . . . 6
| |
| 22 | 2cnd 9206 |
. . . . . 6
| |
| 23 | 16 | a1i 9 |
. . . . . 6
|
| 24 | 21, 22, 23 | divcanap3d 8965 |
. . . . 5
|
| 25 | 24 | oveq1d 6028 |
. . . 4
|
| 26 | 20, 25 | eqtrd 2262 |
. . 3
|
| 27 | 26 | breq2d 4098 |
. 2
|
| 28 | zre 9473 |
. . . 4
| |
| 29 | halfre 9347 |
. . . . 5
| |
| 30 | 29 | a1i 9 |
. . . 4
|
| 31 | 28, 30 | readdcld 8199 |
. . 3
|
| 32 | halfge0 9350 |
. . . 4
| |
| 33 | 28, 30 | addge01d 8703 |
. . . 4
|
| 34 | 32, 33 | mpbii 148 |
. . 3
|
| 35 | 1red 8184 |
. . . 4
| |
| 36 | halflt1 9351 |
. . . . 5
| |
| 37 | 36 | a1i 9 |
. . . 4
|
| 38 | 30, 35, 28, 37 | ltadd2dd 8592 |
. . 3
|
| 39 | btwnzge0 10550 |
. . 3
| |
| 40 | 31, 3, 34, 38, 39 | syl22anc 1272 |
. 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 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 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-mulrcl 8121 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-1rid 8129 ax-0id 8130 ax-rnegex 8131 ax-precex 8132 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-ltwlin 8135 ax-pre-lttrn 8136 ax-pre-apti 8137 ax-pre-ltadd 8138 ax-pre-mulgt0 8139 ax-pre-mulext 8140 |
| This theorem depends on definitions: df-bi 117 df-3or 1003 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-reu 2515 df-rmo 2516 df-rab 2517 df-v 2802 df-sbc 3030 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-int 3927 df-br 4087 df-opab 4149 df-id 4388 df-po 4391 df-iso 4392 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-iota 5284 df-fun 5326 df-fv 5332 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-sub 8342 df-neg 8343 df-reap 8745 df-ap 8752 df-div 8843 df-inn 9134 df-2 9192 df-n0 9393 df-z 9470 |
| This theorem is referenced by: oddnn02np1 12431 |
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