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Mirrors > Home > MPE Home > Th. List > geoihalfsum | Structured version Visualization version Unicode version |
Description: Prove that the infinite geometric series of 1/2, 1/2 + 1/4 + 1/8 + ... = 1. Uses geoisum1 14610. This is a representation of .111... in binary with an infinite number of 1's. Theorem 0.999... 14612 proves a similar claim for .999... in base 10. (Contributed by David A. Wheeler, 4-Jan-2017.) |
Ref | Expression |
---|---|
geoihalfsum |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2cn 11091 | . . . . 5 | |
2 | 1 | a1i 11 | . . . 4 |
3 | 2ne0 11113 | . . . . 5 | |
4 | 3 | a1i 11 | . . . 4 |
5 | nnz 11399 | . . . 4 | |
6 | 2, 4, 5 | exprecd 13016 | . . 3 |
7 | 6 | sumeq2i 14429 | . 2 |
8 | halfcn 11247 | . . . 4 | |
9 | halfre 11246 | . . . . . 6 | |
10 | 0le1 10551 | . . . . . . 7 | |
11 | 1re 10039 | . . . . . . . 8 | |
12 | 2re 11090 | . . . . . . . 8 | |
13 | 2pos 11112 | . . . . . . . 8 | |
14 | ge0div 10890 | . . . . . . . 8 | |
15 | 11, 12, 13, 14 | mp3an 1424 | . . . . . . 7 |
16 | 10, 15 | mpbi 220 | . . . . . 6 |
17 | absid 14036 | . . . . . 6 | |
18 | 9, 16, 17 | mp2an 708 | . . . . 5 |
19 | halflt1 11250 | . . . . 5 | |
20 | 18, 19 | eqbrtri 4674 | . . . 4 |
21 | geoisum1 14610 | . . . 4 | |
22 | 8, 20, 21 | mp2an 708 | . . 3 |
23 | 1mhlfehlf 11251 | . . . 4 | |
24 | 23 | oveq2i 6661 | . . 3 |
25 | ax-1cn 9994 | . . . . 5 | |
26 | ax-1ne0 10005 | . . . . 5 | |
27 | 25, 1, 26, 3 | divne0i 10773 | . . . 4 |
28 | 8, 27 | dividi 10758 | . . 3 |
29 | 22, 24, 28 | 3eqtri 2648 | . 2 |
30 | 7, 29 | eqtr3i 2646 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wb 196 wceq 1483 wcel 1990 wne 2794 class class class wbr 4653 cfv 5888 (class class class)co 6650 cc 9934 cr 9935 cc0 9936 c1 9937 clt 10074 cle 10075 cmin 10266 cdiv 10684 cn 11020 c2 11070 cexp 12860 cabs 13974 csu 14416 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-inf2 8538 ax-cnex 9992 ax-resscn 9993 ax-1cn 9994 ax-icn 9995 ax-addcl 9996 ax-addrcl 9997 ax-mulcl 9998 ax-mulrcl 9999 ax-mulcom 10000 ax-addass 10001 ax-mulass 10002 ax-distr 10003 ax-i2m1 10004 ax-1ne0 10005 ax-1rid 10006 ax-rnegex 10007 ax-rrecex 10008 ax-cnre 10009 ax-pre-lttri 10010 ax-pre-lttrn 10011 ax-pre-ltadd 10012 ax-pre-mulgt0 10013 ax-pre-sup 10014 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-fal 1489 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-nel 2898 df-ral 2917 df-rex 2918 df-reu 2919 df-rmo 2920 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-se 5074 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-pred 5680 df-ord 5726 df-on 5727 df-lim 5728 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-isom 5897 df-riota 6611 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-om 7066 df-1st 7168 df-2nd 7169 df-wrecs 7407 df-recs 7468 df-rdg 7506 df-1o 7560 df-oadd 7564 df-er 7742 df-pm 7860 df-en 7956 df-dom 7957 df-sdom 7958 df-fin 7959 df-sup 8348 df-inf 8349 df-oi 8415 df-card 8765 df-pnf 10076 df-mnf 10077 df-xr 10078 df-ltxr 10079 df-le 10080 df-sub 10268 df-neg 10269 df-div 10685 df-nn 11021 df-2 11079 df-3 11080 df-n0 11293 df-z 11378 df-uz 11688 df-rp 11833 df-fz 12327 df-fzo 12466 df-fl 12593 df-seq 12802 df-exp 12861 df-hash 13118 df-cj 13839 df-re 13840 df-im 13841 df-sqrt 13975 df-abs 13976 df-clim 14219 df-rlim 14220 df-sum 14417 |
This theorem is referenced by: omssubadd 30362 |
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