| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 9435 |
. . . . . . 7
| |
| 2 | 1 | a1i 9 |
. . . . . 6
|
| 3 | id 19 |
. . . . . 6
| |
| 4 | 2, 3 | zmulcld 9536 |
. . . . 5
|
| 5 | 4 | peano2zd 9533 |
. . . 4
|
| 6 | 5 | zred 9530 |
. . 3
|
| 7 | 2re 9141 |
. . . 4
| |
| 8 | 7 | a1i 9 |
. . 3
|
| 9 | 2pos 9162 |
. . . 4
| |
| 10 | 9 | a1i 9 |
. . 3
|
| 11 | ge0div 8979 |
. . 3
| |
| 12 | 6, 8, 10, 11 | syl3anc 1250 |
. 2
|
| 13 | 4 | zcnd 9531 |
. . . . 5
|
| 14 | 1cnd 8123 |
. . . . 5
| |
| 15 | 2cn 9142 |
. . . . . . 7
| |
| 16 | 2ap0 9164 |
. . . . . . 7
| |
| 17 | 15, 16 | pm3.2i 272 |
. . . . . 6
|
| 18 | 17 | a1i 9 |
. . . . 5
|
| 19 | divdirap 8805 |
. . . . 5
| |
| 20 | 13, 14, 18, 19 | syl3anc 1250 |
. . . 4
|
| 21 | zcn 9412 |
. . . . . 6
| |
| 22 | 2cnd 9144 |
. . . . . 6
| |
| 23 | 16 | a1i 9 |
. . . . . 6
|
| 24 | 21, 22, 23 | divcanap3d 8903 |
. . . . 5
|
| 25 | 24 | oveq1d 5982 |
. . . 4
|
| 26 | 20, 25 | eqtrd 2240 |
. . 3
|
| 27 | 26 | breq2d 4071 |
. 2
|
| 28 | zre 9411 |
. . . 4
| |
| 29 | halfre 9285 |
. . . . 5
| |
| 30 | 29 | a1i 9 |
. . . 4
|
| 31 | 28, 30 | readdcld 8137 |
. . 3
|
| 32 | halfge0 9288 |
. . . 4
| |
| 33 | 28, 30 | addge01d 8641 |
. . . 4
|
| 34 | 32, 33 | mpbii 148 |
. . 3
|
| 35 | 1red 8122 |
. . . 4
| |
| 36 | halflt1 9289 |
. . . . 5
| |
| 37 | 36 | a1i 9 |
. . . 4
|
| 38 | 30, 35, 28, 37 | ltadd2dd 8530 |
. . 3
|
| 39 | btwnzge0 10480 |
. . 3
| |
| 40 | 31, 3, 34, 38, 39 | syl22anc 1251 |
. 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2180 ax-14 2181 ax-ext 2189 ax-sep 4178 ax-pow 4234 ax-pr 4269 ax-un 4498 ax-setind 4603 ax-cnex 8051 ax-resscn 8052 ax-1cn 8053 ax-1re 8054 ax-icn 8055 ax-addcl 8056 ax-addrcl 8057 ax-mulcl 8058 ax-mulrcl 8059 ax-addcom 8060 ax-mulcom 8061 ax-addass 8062 ax-mulass 8063 ax-distr 8064 ax-i2m1 8065 ax-0lt1 8066 ax-1rid 8067 ax-0id 8068 ax-rnegex 8069 ax-precex 8070 ax-cnre 8071 ax-pre-ltirr 8072 ax-pre-ltwlin 8073 ax-pre-lttrn 8074 ax-pre-apti 8075 ax-pre-ltadd 8076 ax-pre-mulgt0 8077 ax-pre-mulext 8078 |
| This theorem depends on definitions: df-bi 117 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2194 df-cleq 2200 df-clel 2203 df-nfc 2339 df-ne 2379 df-nel 2474 df-ral 2491 df-rex 2492 df-reu 2493 df-rmo 2494 df-rab 2495 df-v 2778 df-sbc 3006 df-dif 3176 df-un 3178 df-in 3180 df-ss 3187 df-pw 3628 df-sn 3649 df-pr 3650 df-op 3652 df-uni 3865 df-int 3900 df-br 4060 df-opab 4122 df-id 4358 df-po 4361 df-iso 4362 df-xp 4699 df-rel 4700 df-cnv 4701 df-co 4702 df-dm 4703 df-iota 5251 df-fun 5292 df-fv 5298 df-riota 5922 df-ov 5970 df-oprab 5971 df-mpo 5972 df-pnf 8144 df-mnf 8145 df-xr 8146 df-ltxr 8147 df-le 8148 df-sub 8280 df-neg 8281 df-reap 8683 df-ap 8690 df-div 8781 df-inn 9072 df-2 9130 df-n0 9331 df-z 9408 |
| This theorem is referenced by: oddnn02np1 12306 |
| Copyright terms: Public domain | W3C validator |