Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > lesub0 | Unicode version |
Description: Lemma to show a nonnegative number is zero. (Contributed by NM, 8-Oct-1999.) (Proof shortened by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
lesub0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0red 7120 | . . 3 | |
2 | letri3 7192 | . . 3 | |
3 | 1, 2 | sylan2 280 | . 2 |
4 | ancom 262 | . . 3 | |
5 | simpr 108 | . . . . . . 7 | |
6 | 0red 7120 | . . . . . . 7 | |
7 | simpl 107 | . . . . . . 7 | |
8 | lesub2 7561 | . . . . . . 7 | |
9 | 5, 6, 7, 8 | syl3anc 1169 | . . . . . 6 |
10 | 7 | recnd 7147 | . . . . . . . 8 |
11 | 10 | subid1d 7408 | . . . . . . 7 |
12 | 11 | breq1d 3795 | . . . . . 6 |
13 | 9, 12 | bitrd 186 | . . . . 5 |
14 | 13 | ancoms 264 | . . . 4 |
15 | 14 | anbi2d 451 | . . 3 |
16 | 4, 15 | syl5bb 190 | . 2 |
17 | 3, 16 | bitr2d 187 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wb 103 wceq 1284 wcel 1433 class class class wbr 3785 (class class class)co 5532 cr 6980 cc0 6981 cle 7154 cmin 7279 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-addcom 7076 ax-addass 7078 ax-distr 7080 ax-i2m1 7081 ax-0id 7084 ax-rnegex 7085 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-apti 7091 ax-pre-ltadd 7092 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rab 2357 df-v 2603 df-sbc 2816 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-br 3786 df-opab 3840 df-id 4048 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-iota 4887 df-fun 4924 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 |
This theorem is referenced by: lesub0i 7597 |
Copyright terms: Public domain | W3C validator |