“Science”目录存档

第一个向西欧传播世俗观念和科学的其实是MSL

2009年12月26日,星期六

摘录《黑天鹅》,在11世纪的西欧:

The eleventh-century Arabic-language skeptic Al-Ghazali, known in Latin as Algazel wrote a diatribe called Tahafut al falasifa, which I translate as "The Incompetence of Philosophy." It was directed at the school called falasifah — the Arabic intellectual establishment was the direct heir of the classical philosophy of the academy, and they managed to reconcile it with Islam through rational argument.
Algazel's attack on "scientific" knowledge started a debate with Averroës, the medieval philosopher who ended up having the most profound influence of any medieval thinker (on Jews and Christians, though not on Moslems). The debate between Algazel and Averroës was finally, but sadly, won by both. In its aftermath, many Arab religious thinkers integrated and exaggerated Algazel's skepticism of the scientific method, preferring to leave causal considerations to God (in fact it was a stretch of his idea). The West embraced Averroës's rationalism, built upon Aristotle's, which survived through Aquinas and the Jewish philosophers who called themselves Averroan for a long time. Many thinkers blame the Arabs' later abandonment of scientific method on Algazel's huge influence. He ended up fueling Sufi mysticism, in which the worshipper attempts to enter into communion with God, severing all connections with earthly matters.

我们很多时候看到的是时代的下限,却忽略了它华丽的拱顶。

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They say math's the universal language, but this is all gibberish to me.

2009年12月25日,星期五

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ontology

2009年12月24日,星期四

ontology是个metaphysics词语。。。我也是今天第一次听说。。。Semantic Web提到这个概念比较多。。。。反正我感觉就是把一个名词抽象化和归类的东西。实际简单应用的例子就是可以作为一个标准来把Last.FM和iTunes里混乱的各种音乐版本结构化归类。

举个例子:Music Ontology里的Record Types就分为

album
audiobook
compilation
ep
interview
live
soundtrack
spokenword
remix
encoding

BBC在也有一个关于 节目 的ontology

从这一点就佩服BBC的职业水准了。

最近QT不是引入了ECMAScript,可以scripting整个QT。太酷了。Zed Shaw甚至认为 qt is RDF。还做了个视频,用 Qt script debugger and do a bunch of SPARQL queries straight from Javascript against the BBC music ontology record for Nirvana。SPARQL就是RDF的SQL语言。从这一点上来说我觉得QT比GNOME的确要先进了。。。前几天QT的图形绘制能力评测的成绩也比较惊人。。。。看来商业推动的产品的确比义务劳动社区产品在某些方面更加有优势啊。。。

关于Zed Shaw将那个 Music browser 的构思,我也想过相关的。看来音乐这个直接反映人类灵魂的东西辩证唯物主义是包括不下的,必须形而上啊,哈哈。。。

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英语用空洞的词凑字数案例~~~

2009年12月22日,星期二

HN上讨论了一个如何写500字空洞无物文章的案例。假如老师要求写一个关于 WHY COLLEGE FOOTBALL SHOULD BE ABOLISHED 的文章

这里是你能想到的版本:

College football should be abolished because it's bad for the school and also for the players. The players are so busy practicing that they don't have any time for their studies.

这里是职业化灌水的最终版:

In my opinion, it seems to me that college football should be abolished. The reason why I think this to be true is because I feel that football is bad for the colleges in nearly every respect. As Robert Hutchins says in his article in our anthology in which he discusses college football, it would be better if the colleges had race horses and had races with one another, because then the horses would not have to attend classes. I firmly agree with Mr. Hutchins on this point, and I am sure that many other students would agree too.
One reason why it seems to me that college football is bad is that it has become too commercial. In the olden times when people played football just for the fun of it, maybe college football was all right, but they do not play college football just for the fun of it now as they used to in the old days. Nowadays college football is what you might call a big business. Maybe this is not true at all schools, and I don't think it is especially true here at State, but certainly this is the case at most colleges and universities in America nowadays, as Mr. Hutchins points out in his very interesting article. Actually the coaches and alumni go around to the high schools and offer the high school stars large salaries to come to their colleges and play football for them. There was one case where a high school star was offered a convertible if he would play football for a certain college.

Another reason for abolishing college football is that it is bad for the players. They do not have time to get a college education, because they are so busy playing football. A football player has to practice every afternoon from three to six and then he is so tired that he can't concentrate on his studies. He just feels like dropping off to sleep after dinner, and then the next day he goes to his classes without having studied and maybe he fails the test.

Also I think college football is bad for the colleges and the universities because not very many students get to participate in it. Out of a college of ten thousand students only seventy-five or a hundred play football, if that many. Football is what you might call a spectator sport. That means that most people go to watch it but do not play it themselves.

These are the reasons why I agree with Mr. Hutchins that college football should be abolished in American colleges and universities.

想当年。。。俺们中文作文灌水方法都是扩写能扩写词组,然后每一段结束都是一个字加一个句号占一整行。。。。。。虽然最后得分都不怎么高,但是能pass~~~~最后自己读自己的文章都发现,黑压压一大段话只讲了一件很简单很弱智的事情。。。相当的恐怖。。。

所以,发展NLP来做 tl;dr 工具是相当有前景的啊~~~~

激光传音

2009年12月22日,星期二

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在拉格朗日照耀下

2009年12月20日,星期日

很久很久以前,拉格朗日照耀下,有几座城,分别是常微分方城和偏微分方城这两座兄弟城,还有数理方程,随机过城,从这几座城里流出了几条溪,比较著名的有柯溪,数学分溪,泛函分溪,回归分溪,时间序列分溪等,其中某几条溪和支流汇聚在一起,形成了解析几河,微分几河,黎曼几何三条大河,河边长了很多很多数,有高等代树,抽象代树,线性代树,实变函树,复变函树,数值代树等,还有长满了傅立叶的级树...人们专门在这些树边放了许多的盖(概)桶,高桶,因为,这是用来放尸体的,挂在上面的人,太多了,太多了...

这些人死后就葬在微积坟,坟的后面是一片广阔的麦克劳林,林子里有一只费马,它喜欢在柯溪喝水,溪的两头是渐近县和极县,村民们的主食是无穷小粮...

后来,芬斯勒几河改道,几河不能同调,工程师李群不得不微分流形,调河分溪。几河分溪以后,水量大涨,建了个测渡也没有效果,还是挂了很多人,连非交换代树都挂满了,不得不弄到动力系桶里扔掉。

附:

发信人: liuxiaokai (SMS06||别人肉我了,我承认我是汪core), 信区: Joke
标 题: Re: 数学的那个joke……完整版
发信站: 北大未名站 (2009年12月18日17:25:37 星期五), 转信

写这个东西的我那个同学都没说是完整版。。。

好不容易发了个joke十大,结果被删了

2009年12月18日,星期五

昨天那个很YD的帖子发在newsmth的joke版,趁半夜版主不在的时候发的,今天上十大了,去看的时候结果被删了。好吧。。。我还是老老实实把原帖地址抖出来。。。

A single sperm has 37.5MB of DNA information in it. That means that a normal ejaculation represents a data transfer of 1,587.5TB

下面有人评论说:

Moeri 560 points 1 day ago
Ejaculations last about 5 seconds, so that means I can upload at 332TB/s. I am so awesome.

还有很多笑料我就不一一提出了。

记得joke众版霸评论说:

虽然丢包率高达99.9999%,但是只要ping通一个包就传输成功了

LS吹牛吧,100%都被firewall拦截了

然后大家从信息学和生命学的角度分析了这个332TB/s冗余度其实是非常的高的。

莱布尼茨和培根向Rule 32的最高致意!

2009年12月18日,星期五

三篇wikipedia页面。。。。

http://en.wikipedia.org/wiki/Chinese_as_a_Foreign_or_Second_Language#History

http://en.wikipedia.org/wiki/Confusion_of_tongues

http://en.wikipedia.org/wiki/Characteristica_universalis

QFT:

Kurt Gödel, on the other hand, believed that the characteristica universalis was feasible, and that its development would revolutionize mathematical practice

学到一个词语:Nachlass。这个跟道藏有的一拼。

总结:

  1. 超越时代的大牛真的素养非常非常非常高。
  2. 学术界还是有很多非正常人类的。
  3. 现在能接触到的思想,真的还是好几个世纪以前的东西。

井盖为什么是圆的那个面试题,其实是扯谈

2009年12月16日,星期三

今天发现了一个大牛的博客。我觉得相当有启发。

里面一篇文章很有意思:

很多人都知道这个所谓“微软面试题”了:井盖为什么是圆的。

这里比较合理的答案就是 掉不下去,安全。

其实仔细想一下,这个回答其实有个逻辑谬误:

掉不下去,只要 曲线 从每一个角度都 等宽 就OK了。

但是是不是只有圆,才能保证从每一个角度都等宽呢?

等宽曲线有无穷多种,都“掉不下去”,所以,“圆形”只是安全的充分条件,而非必要条件。

等宽曲线,通俗点说,就是用游标卡尺无论从哪个角度量,量出来的宽度都相同。同一宽度的等宽曲线,面积最大的圆,最小的是 Reuleaux 三角形 (鲁列斯三角形/莱洛三角形)

圆形井盖明显是浪费材料了,因为很明显这种 Reuleaux 三角形更加节省材料:

关于这个三角形有趣的例子我也写过一篇blog了。

评丹麦世界气候大会:破船上的大智慧 [zz]

2009年12月16日,星期三

发信人: CH4O (靠谱男|经济适用型), 信区: ClimateChange
标 题: 评丹麦世界气候大会:破船上的大智慧 [zz] (转载)
发信站: 水木社区 (Mon Dec 14 21:16:22 2009), 站内

【 以下文字转载自 Joke 讨论区 】
发信人: SHENOK (陷入经济危机的牙), 信区: Joke
标 题: 评丹麦世界气候大会:破船上的大智慧 [zz]
发信站: 水木社区 (Mon Dec 14 19:08:20 2009), 站内

发信人: zhanghq (24小时在线), 信区: NewExpress
标 题: 评丹麦世界气候大会:破船上的大智慧 [zz]
发信站: 水木社区 (Mon Dec 14 16:30:36 2009), 站内

如果一百多人在漏水的船上讨价还价谁该往外多舀水,那是明摆着的蠢,事实上没人会这么干,连船上那最自私最无耻的人,也会拿出最大公无私的精神拼命舀水的。

但是事情如果再复杂一点,就会有新鲜的现象了。如果船上的人算计一下,在这条船沉没前,他们有足够的时间安全抵达港口,危险属于下一船乘客时,有很多人就会停下来安静地欣赏海景了。

哪怕这条船在抵达港口前的确会沉没一部分,比如灌满一个叫“马尔代夫”的船舱,其他舱室的人,基本上都会无动于衷。

更复杂的是,如果这艘船超重,需要乘客们把身上的金银细软抛下船的话,扯蛋就来了。穷人们说,富人钱多经得起糟蹋你先扔,至少得再扔40%;富人则说穷鬼你那堆破烂儿又沉又不值钱你先扔;穷人说我扔也可以但你富人得拿出年收入的0.5%-1%,即3000块补偿给我,还得教会我发财致富的秘诀,富人说你丫做白日梦吧老子已经一年白给你100块了,多了别想,你救的不是我是你自己。

穷人说老子才刚坐这船没两天,你狗日富人坐好几年了,生生把新船坐成了破船,现在多出点血是天经地义的;富人说以前天杀的知道这船是会坐破的,再说如果不是我们富人天天捣鼓这船,你这帮农民今天还在刨地球,能懂航海术、看西洋景?今天这船要沉了也是我们发现的,要不你们这帮賤人淹死了都不知道咋回事。

蛋还没扯完,眼见船越来越漏的厉害。于是船客们聚到“日本房间”,穷人们靠着人多强行通过了一份《京都协议书》,要求富人赶紧扔东西,穷人却可以不扔。最富的富人米利坚说,这是明显的 ** 嘛,天下哪有这道理,俺不玩了。穷人说你B一家最重,负担就占了全船的近1/5,你不扔谁扔?米利坚说我的东西是最重,但也最值钱。俺以全船1/4的值钱物件才占了1/5的重量,凭啥我扔?你们看看那叫拆哪的穷鬼,以不到3%的价值也占了近1/5的负担,为啥不让他多扔?

黑眼睛黑头发黄皮肤的拆哪一听急了:穷兄弟们别听他的,俺们可都是穷苦人家出身,你们要是把我推出来,以后你们中有人小偷小摸耍流氓谁罩着啊?好歹这船是大家的,你米利坚就是东西最多最重,这船也属你坐的时间最长次数最多,看我干啥?凭啥?你凭啥?这最怕船沉的不是咱穷棒子是富人,他们经不起大规模人员伤亡。

为了尽快把蛋扯完,船客们最近又在一间叫“丹麦”的房间开了一个会。据最新消息,把蛋扯完的机会已经很渺茫。最重大的成果将是形成一份《哥本哈根共识》,这份有所有船客签名的共识说:“我们都发现并且承认,这船在漏水,而且是会沉的。”

这份共识发表后,船客们纷纷接到恭喜电话,表扬他们表现出了高超的政治智慧,并且坚定地捍卫了国家利益。

发信人: wuhuliuqing (superliu), 信区: ClimateChange
标 题: Re: 评丹麦世界气候大会:破船上的大智慧 [zz] (转载)
发信站: 水木社区 (Tue Dec 15 00:28:03 2009), 站内

最后发现,关于船会沉的消息是假的!是阴有暗香盈袖毛。这船在过去很多年经常浮起来点或者下降点。倒是船上随地大小便问题才是真的