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Mirrors > Home > ILE Home > Th. List > subhalfnqq | Unicode version |
Description: There is a number which is less than half of any positive fraction. The case where is one is Lemma 11.4 of [BauerTaylor], p. 50, and they use the word "approximate half" for such a number (since there may be constructions, for some structures other than the rationals themselves, which rely on such an approximate half but do not require division by two as seen at halfnqq 6508). (Contributed by Jim Kingdon, 25-Nov-2019.) |
Ref | Expression |
---|---|
subhalfnqq |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | halfnqq 6508 | . . . . . 6 | |
2 | df-rex 2312 | . . . . . . 7 | |
3 | halfnqq 6508 | . . . . . . . . . 10 | |
4 | 3 | adantr 261 | . . . . . . . . 9 |
5 | 4 | ancli 306 | . . . . . . . 8 |
6 | 5 | eximi 1491 | . . . . . . 7 |
7 | 2, 6 | sylbi 114 | . . . . . 6 |
8 | 1, 7 | syl 14 | . . . . 5 |
9 | df-rex 2312 | . . . . . . 7 | |
10 | 9 | anbi2i 430 | . . . . . 6 |
11 | 10 | exbii 1496 | . . . . 5 |
12 | 8, 11 | sylib 127 | . . . 4 |
13 | exdistr 1787 | . . . 4 | |
14 | 12, 13 | sylibr 137 | . . 3 |
15 | simprl 483 | . . . . . 6 | |
16 | simpll 481 | . . . . . . . . 9 | |
17 | ltaddnq 6505 | . . . . . . . . 9 | |
18 | 16, 16, 17 | syl2anc 391 | . . . . . . . 8 |
19 | breq2 3768 | . . . . . . . . 9 | |
20 | 19 | ad2antlr 458 | . . . . . . . 8 |
21 | 18, 20 | mpbid 135 | . . . . . . 7 |
22 | breq1 3767 | . . . . . . . 8 | |
23 | 22 | ad2antll 460 | . . . . . . 7 |
24 | 21, 23 | mpbird 156 | . . . . . 6 |
25 | 15, 24 | jca 290 | . . . . 5 |
26 | 25 | eximi 1491 | . . . 4 |
27 | 26 | exlimiv 1489 | . . 3 |
28 | 14, 27 | syl 14 | . 2 |
29 | df-rex 2312 | . 2 | |
30 | 28, 29 | sylibr 137 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wb 98 wceq 1243 wex 1381 wcel 1393 wrex 2307 class class class wbr 3764 (class class class)co 5512 cnq 6378 cplq 6380 cltq 6383 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-13 1404 ax-14 1405 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-coll 3872 ax-sep 3875 ax-nul 3883 ax-pow 3927 ax-pr 3944 ax-un 4170 ax-setind 4262 ax-iinf 4311 |
This theorem depends on definitions: df-bi 110 df-dc 743 df-3or 886 df-3an 887 df-tru 1246 df-fal 1249 df-nf 1350 df-sb 1646 df-eu 1903 df-mo 1904 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ne 2206 df-ral 2311 df-rex 2312 df-reu 2313 df-rab 2315 df-v 2559 df-sbc 2765 df-csb 2853 df-dif 2920 df-un 2922 df-in 2924 df-ss 2931 df-nul 3225 df-pw 3361 df-sn 3381 df-pr 3382 df-op 3384 df-uni 3581 df-int 3616 df-iun 3659 df-br 3765 df-opab 3819 df-mpt 3820 df-tr 3855 df-eprel 4026 df-id 4030 df-iord 4103 df-on 4105 df-suc 4108 df-iom 4314 df-xp 4351 df-rel 4352 df-cnv 4353 df-co 4354 df-dm 4355 df-rn 4356 df-res 4357 df-ima 4358 df-iota 4867 df-fun 4904 df-fn 4905 df-f 4906 df-f1 4907 df-fo 4908 df-f1o 4909 df-fv 4910 df-ov 5515 df-oprab 5516 df-mpt2 5517 df-1st 5767 df-2nd 5768 df-recs 5920 df-irdg 5957 df-1o 6001 df-oadd 6005 df-omul 6006 df-er 6106 df-ec 6108 df-qs 6112 df-ni 6402 df-pli 6403 df-mi 6404 df-lti 6405 df-plpq 6442 df-mpq 6443 df-enq 6445 df-nqqs 6446 df-plqqs 6447 df-mqqs 6448 df-1nqqs 6449 df-rq 6450 df-ltnqqs 6451 |
This theorem is referenced by: prarloc 6601 cauappcvgprlemloc 6750 caucvgprlemloc 6773 caucvgprprlemml 6792 caucvgprprlemloc 6801 |
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