At around 5pm, while going to release myself, I sneezed and the pee stopped immediately. This reminds me of momentum conservation. You know both sneeze and pee will make you lose some momentum in the same direction because our nose and urinary system work in the same direction. Th ...
Because thousands of authors would appaer on a research paper in our field. For example, the famous paper from ATLAS reporting the observation of the Higgs boson has around 3000 authors. This is not unique. Because every paper from the ATLAS collaboration would have around 3000 authors. ...
A few days ago, the LHCb collaboration reported an evidence for Lepton Universality Violation (LUV) in the beauty-quark decays B - K l + l - where l represents muon or electron. They measured the ratio of muon to electron to be (more details see their paper ) This ratio i ...
Recently, Kai-Liang brought to my attention an extension form of the classic inequality of the arithmetic and geometric means. It is easy to see C2=1. It is not easy to calculate C3. I spent a couple of days on this problem and found the solution. My method is very sta ...
I was shocked the first time when I knew Fourier transformtion. It is amazing that nearly any function could be expanded as a sum of simple sine and cosine functions. It is very different from another famous expansion, Taylor expansion. Taylor expansion focuses on one point while Fourier ...
素数基本定理 是描述素数分布的一个非常重要的定理。它表明素数的密度大约是1/log(x)，即 不大于x内的素数个数大约为x/log(x) 。 Jacques Solomon Hadamard和Charles-Jean de la Vallée Poussin于1896年按照B. Riemann的思想首次证明。 简单地说，素数基本定理等价于 黎曼zeta函数zeta(s)在实部为1的 ...
I knew this problem in a WeChat group chat. It is said to be a problem for primary-school students. Here is the problem. How many integers with all digits being just 1,2 or 3 and the sum of all digits being 10? For example, 12331 and 22222. We could ask a more general qu ...
昨天晚上设了闹钟，凌晨02:30，因为这个时候金星才从东方升起。 凌晨2点半，闹钟准时响起，脑袋还有点不清醒。拿起眼镜和手机，迅速跑上天台。唿，凉爽！瞬间清醒。 金星如约而至，比我想象中小，就在月亮下方。周围有御夫座，双子座，猎户座，白羊座和金牛座。下面的图片都是我用手机拍出来的，也有Star Wa ...
博文
视频
基金
相册
收藏
积分
会议