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無理数時計作ってみた
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Naoki Sasaki
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研究室の同期とハッカソンで作った無理数時計の紹介。 @名状しがたいお茶会
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無理数時計作ってみた
1.
2.
今日話す内容 研究室の同期とハッカソンで作った時計 2017/2/20 nsasaki128 1
3.
参加したハッカソン • 500 startups主催 •
テーマは『時間』 2017/2/20 nsasaki128 2
4.
当然の思考 時間 2017/2/20 nsasaki128 3 数字 無理数 0123456789
5.
無理数とは 繰り返しがない無限小数のこと 2017/2/20 nsasaki128 4 代表的な無理数 3.141592653589793238462643383279502884197169399375105820 97494459230781640628620899862803482534211706798214808651328 230664709384460955058223172535940812848111745028410270193852110 5559644622......
6.
無理数とは 繰り返しがない無限小数のこと 2017/2/20 nsasaki128 5 3.141592653589793238462643383279502884197169399375105820 97494459230781640628620899862803482534211706798214808651328 230664709384460955058223172535940812848111745028410270193852110 5559644622...... 代表的な無理数
7.
無理数とは 繰り返しがない無限小数のこと 2017/2/20 nsasaki128 6 3.141592653589793238462643383279502884197169399375105820 97494459230781640628620899862803482534211706798214808651328 230664709384460955058223172535940812848111745028410270193852110 5559644622...... 代表的な無理数
8.
無理数とは 繰り返しがない無限小数のこと 2017/2/20 nsasaki128 7 3.141592653589793238462643383279502884197169399375105820 97494459230781640628620899862803482534211706798214808651328 230664709384460955058223172535940812848111745028410270193852110 5559644622...... 代表的な無理数
9.
無理数とは 繰り返しがない無限小数のこと 2017/2/20 nsasaki128 8 3.14159265358979323846264338327950288419716939937510:58:20 97494459230781640628620899862803:48:253421:17:0679821480865132823 066470938446095505822317253594081284811174502841027019385211055 59644622...... 代表的な無理数
10.
2017/2/20 nsasaki128 9 無理数で 時間を表せる!!
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作ってみた https://hyurumi.github.io/MuriSuDokei/ 2017/2/20 nsasaki128 10
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2017/2/20 nsasaki128 11
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理論的裏づけ 数字の並びがランダムと仮定して 000000~235959 までのすべての数字が揃うのに必要な桁数 の期待値を求めた。 2017/2/20 nsasaki128 12
14.
理論的裏づけ 数字の並びがランダムと仮定して 000000~235959 までのすべての数字が揃うのに必要な桁数 の期待値を求めた。 → 約11,366,743桁 2017/2/20 nsasaki128
13
15.
代表的な無理数の結果 2017/2/20 nsasaki128 14 最強の時間
最強の時間の場所 円周率 16:25:42 10,524,624 自然対数の底 14:54:06 11,460,352 黄金比 02:06:38 11,105,487 23:58:56 10,849,282 17:54:03 12,983,302 ※期待値:11,366,743
16.
代表的な無理数の結果 2017/2/20 nsasaki128 15 最強の時間
最強の時間の場所 円周率 16:25:42 10,524,624 自然対数の底 14:54:06 11,460,352 黄金比 02:06:38 11,105,487 23:58:56 10,849,282 17:54:03 12,983,302 ※期待値:11,366,743
17.
まとめ • 無理数時計を作ってみた • 必要な桁数を頑張って期待値計算をした •
実測したら概ね期待値通りだった 2017/2/20 nsasaki128 16
18.
2017/2/20 nsasaki128 17 おまけ
19.
無理数時計にならない無理数 小数点以下の桁数が素数だけ1それ以外は0 0.01101010001010001010001000001...... 無限小数(素数は無限)かつ循環小数でない →無理数 0と1しかないので時刻が表せない!!! 2017/2/20 nsasaki128 18
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