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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 9354 |
. . . . . . 7
| |
| 2 | 1 | a1i 9 |
. . . . . 6
|
| 3 | id 19 |
. . . . . 6
| |
| 4 | 2, 3 | zmulcld 9454 |
. . . . 5
|
| 5 | 4 | peano2zd 9451 |
. . . 4
|
| 6 | 5 | zred 9448 |
. . 3
|
| 7 | 2re 9060 |
. . . 4
| |
| 8 | 7 | a1i 9 |
. . 3
|
| 9 | 2pos 9081 |
. . . 4
| |
| 10 | 9 | a1i 9 |
. . 3
|
| 11 | ge0div 8898 |
. . 3
| |
| 12 | 6, 8, 10, 11 | syl3anc 1249 |
. 2
|
| 13 | 4 | zcnd 9449 |
. . . . 5
|
| 14 | 1cnd 8042 |
. . . . 5
| |
| 15 | 2cn 9061 |
. . . . . . 7
| |
| 16 | 2ap0 9083 |
. . . . . . 7
| |
| 17 | 15, 16 | pm3.2i 272 |
. . . . . 6
|
| 18 | 17 | a1i 9 |
. . . . 5
|
| 19 | divdirap 8724 |
. . . . 5
| |
| 20 | 13, 14, 18, 19 | syl3anc 1249 |
. . . 4
|
| 21 | zcn 9331 |
. . . . . 6
| |
| 22 | 2cnd 9063 |
. . . . . 6
| |
| 23 | 16 | a1i 9 |
. . . . . 6
|
| 24 | 21, 22, 23 | divcanap3d 8822 |
. . . . 5
|
| 25 | 24 | oveq1d 5937 |
. . . 4
|
| 26 | 20, 25 | eqtrd 2229 |
. . 3
|
| 27 | 26 | breq2d 4045 |
. 2
|
| 28 | zre 9330 |
. . . 4
| |
| 29 | halfre 9204 |
. . . . 5
| |
| 30 | 29 | a1i 9 |
. . . 4
|
| 31 | 28, 30 | readdcld 8056 |
. . 3
|
| 32 | halfge0 9207 |
. . . 4
| |
| 33 | 28, 30 | addge01d 8560 |
. . . 4
|
| 34 | 32, 33 | mpbii 148 |
. . 3
|
| 35 | 1red 8041 |
. . . 4
| |
| 36 | halflt1 9208 |
. . . . 5
| |
| 37 | 36 | a1i 9 |
. . . 4
|
| 38 | 30, 35, 28, 37 | ltadd2dd 8449 |
. . 3
|
| 39 | btwnzge0 10390 |
. . 3
| |
| 40 | 31, 3, 34, 38, 39 | syl22anc 1250 |
. 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4151 ax-pow 4207 ax-pr 4242 ax-un 4468 ax-setind 4573 ax-cnex 7970 ax-resscn 7971 ax-1cn 7972 ax-1re 7973 ax-icn 7974 ax-addcl 7975 ax-addrcl 7976 ax-mulcl 7977 ax-mulrcl 7978 ax-addcom 7979 ax-mulcom 7980 ax-addass 7981 ax-mulass 7982 ax-distr 7983 ax-i2m1 7984 ax-0lt1 7985 ax-1rid 7986 ax-0id 7987 ax-rnegex 7988 ax-precex 7989 ax-cnre 7990 ax-pre-ltirr 7991 ax-pre-ltwlin 7992 ax-pre-lttrn 7993 ax-pre-apti 7994 ax-pre-ltadd 7995 ax-pre-mulgt0 7996 ax-pre-mulext 7997 |
| This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-reu 2482 df-rmo 2483 df-rab 2484 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-uni 3840 df-int 3875 df-br 4034 df-opab 4095 df-id 4328 df-po 4331 df-iso 4332 df-xp 4669 df-rel 4670 df-cnv 4671 df-co 4672 df-dm 4673 df-iota 5219 df-fun 5260 df-fv 5266 df-riota 5877 df-ov 5925 df-oprab 5926 df-mpo 5927 df-pnf 8063 df-mnf 8064 df-xr 8065 df-ltxr 8066 df-le 8067 df-sub 8199 df-neg 8200 df-reap 8602 df-ap 8609 df-div 8700 df-inn 8991 df-2 9049 df-n0 9250 df-z 9327 |
| This theorem is referenced by: oddnn02np1 12045 |
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