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能不能用数学解释“耳机打结
添加时间:2016-12-22 12:16:09 浏览次数: 作者:未知
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  • Is There Any Mathematical Explanation for the Entanglement1 of the Earphones?

    能不能用数学解释下“为什么耳机老打结”?

    获得128好评的的回答@Conner Davis

    There’s paper I can't find at the moment that analyzes3 the probability of a length of string tangling4 in your pocket in an hour as a function of its length. They found that a string of 23cm or more will probably form a knot within the first hour.

    有一篇这样的论文,不过我现在找不到了,它分析了口袋里的绳子在1小时内打结的概率与绳子长度的关系,还提出了一个以绳长为x的函数。他们发现长度为23厘米或者以上的绳子可能在第1个小时内就打结。

    Your headphones are longer than that and have three ends instead of two, so the probability they will remain untangled for an hour is even lower.

    你的耳机比23厘米要长,而且总共有3个头,所以它在第1个小时里不打结的概率会更加低。

    获得1.7k好评的回答@Senia Sheydvasser

    Back in 1989, Nicholas Pippenger wrote a paper about knots in random5 walks. What he showed is that if you have a random walk on the 3D lattice, the probability of that walk forming a knot goes to very, very quickly.

    早在1989年,Nicholas Pippenger就曾写过一篇关于“随机游动中的绳结”的论文。文中写道如果你在一个3D环境中做随机游动,游动中形成绳结的概率将非常大。

    There has been other work on knots in random walks since then, and the common thread seems to be that knots form much more readily than you think they do. If your earphones are jostling around in your pocket at all, the probability that they will tangle2 is high.

    从那以后,陆续出了其他关于“随机游动中的绳结”的著作。普通的线比你想象中更容易打结,容易得多。如果你的耳机线不停地在你的口袋里互相推撞,它们打结的可能性将非常高。

     12级    双语 
     单词标签: entanglement  tangle  analyzes  tangling  random 


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    1 entanglement [ɪnˈtæŋglmənt] HoExt   第11级
    n.纠缠,牵累
    参考例句:
    • This entanglement made Carrie anxious for a change of some sort. 这种纠葛弄得嘉莉急于改变一下。
    • There is some uncertainty about this entanglement with the city treasurer which you say exists. 对于你所说的与市财政局长之间的纠葛,大家有些疑惑。
    2 tangle [ˈtæŋgl] yIQzn   第7级
    n.纠缠;缠结;混乱;vt.&vi.(使)缠绕;变乱
    参考例句:
    • I shouldn't tangle with Peter. He is bigger than me. 我不应该与彼特吵架。他的块头比我大。
    • If I were you, I wouldn't tangle with them. 我要是你,我就不跟他们争吵。
    3 analyzes [ˈænəlaiziz] e2e80b8320e1dd8d4c035d41fd7e44e5   第7级
    v.分析( analyze的第三人称单数 );分解;解释;对…进行心理分析
    参考例句:
    • This approach analyzes management by studying experience usually through cases. 这个学派通常从实例获得经验,用以分析管理。 来自辞典例句
    • The econometrician analyzes statistical data. 经济计量学者要分析统计材料。 来自辞典例句
    4 tangling [ˈtæŋɡlɪŋ] 06e2d6380988bb94672d6dde48f3ec3c   第7级
    (使)缠结, (使)乱作一团( tangle的现在分词 )
    参考例句:
    • During match with football, sportsman is like tangling on the football field. 足球比赛时,运动员似在足球场上混战。
    • Furthermore the built in cable rewind prevents tangling and prolongs cable life. 此外,在防止缠绕电缆退建,延长电缆使用寿命。
    5 random [ˈrændəm] HT9xd   第7级
    adj.随机的;任意的;n.偶然的(或随便的)行动
    参考例句:
    • The list is arranged in a random order. 名单排列不分先后。
    • On random inspection the meat was found to be bad. 经抽查,发现肉变质了。

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