Blog entries with tag “Jots

Pokémon Let's Go Pikachu 一周目通关

我感恩节期间买了 Nintendo Switch,是为了玩 Pokémon Let's Go Pikachu,也就是《口袋妖怪·黄》的重制版,为此我还配上了 Pokéball Plus(配信梦幻的精灵球形状的遥控器,也可以作计步器用)。刚刚结束一周目(登入名人堂),写篇博文记录一下。

Pokémon Let's Go Pikachu 一周目通关

《铁甲小宝》轶事

我的博客中第一次提到《铁甲小宝》是在《清华网络碎碎念:交费死锁》,最近我又在杂乱地复习它,发现了一些有趣的事情。本篇博文介绍这些内容,并记录一些备忘知识。

《铁甲小宝》轶事

谈“理想”和其他

理想(ideal)是出现在抽象代数(更特别地,环论)中的一类对象,其命名很有渊源。之前我只知道这个名字来源于一位数学家研究惟一分解时引入的“理想数”(该研究的思路和一般化最终形成了现代数学语言中“理想”的定义),但是具体的细节不是很明白;最近在阅读基于格(lattice)的密码学的内容,其中提到了环上的格(ring lattice),其中提到了理想格(环的一个子集,同时满足格和理想的要求),好奇心一发不可收拾,读了一些数学历史故事,对“理想数”加深了认识,记录下来以飨观众。文章最后讨论了“理想数”这个翻译的不达意之处。

NTFS DELETE_CHILD access and ‘the directory is not empty’

Someone wanted to know how to create a file that denies itself from being removed, yet found he could still remove the file even denying DELETE access from Everyone. The reason is that there is DELETE_CHILD access on its containing directory. How does this relate to ‘the directory is not empty’?

Admission and matriculation

Having accepted an offer to a Doctor of Philosophy program, I have finished my final admission to a higher degree (‘升学’) as doctorate is the highest possible degree. It’s time to review my road to knowledge and thank those who have helped and shaped me.

How to watch movies on UNITED flights

a.k.a. How to be disappointed again by UA. I was visiting New York University and Carnegie Mellon University. Flying from Beijing to New York, from New York to Pittsburgh, from Pittsburgh to Beijing via Chicago, I chose United Airlines, one that suffers from previous scandals on ‘violently reaccomodating a customer’. It turns out that their in-flight entertainment system is also torturing! This entry was written during the flight from Chicago to Beijing.

How to watch movies on UNITED flights

Rethinking base ‘conversion’

Base conversion is the conversion between notations of number, and NOT the numbers themselves. I discuss a common mistake on methods of base conversion, and a common mistake in thinking about ‘base conversion’ in computer programs.

Discount aux Galeries Lafayette and NP-completeness

I allowed myself some CHANEL products to ‘reward’ myself for the acceptance of my first cryptography paper. I also consider spending money at its best value an interesting game. A commonly-seen discount aux Galeries Lafayette Xidan (Beijing) leads to an obviously NP-complete problem. Haha!

Discount aux Galeries Lafayette and NP-completeness

随机过程习题课见闻二则

去听习题课并不是为了听讲习题,而是为了混参与分数(虽然我相信这个课不用参与分数也可以拿很高的分)。虽然,仍然有两则有趣的见闻以飨观众。

(伪)第一次考 GRE 和 TOEFL

首战 GRE 不战而败,首战 TOEFL 可以算是“凯旋归来”吧!第二次战 GRE,感觉稳了。

清华网络碎碎念:交费死锁

清华网络费用非常高!另外,曾经清华网费有死锁,因为使用了网银;后来采用了微信、支付宝,声称解决了死锁。但我今天一试,发现根本不是这样的!(已更新)

清华网络碎碎念:交费死锁

我的信仰之路

我是一个软粉,可能以后变成软黑也不一定。持续更新。

数学文字中的“一般”

数学文字中有很多“一般”,例如“一般地”、“不失一般性”,还有“特别地”等说法,它们的意思和日常中的“一般来说”可大不相同。

被小学生鄙视手表

“等你们长大了,你们就懂得手表的品位了。”虽然我的天梭表也是很野鸡。

Interviewed by THU IIIS

I was participating Advanced Assessment for Admission (AAA) of Tsinghua Union, passed the first phase and was interviewed by Insititute for Interdisciplinary Information Sciences of Tsinghua University. Here is a transcript of the interview.

Interviewed by THU IIIS

去 THU IIIS 面试

我参加了“华约”(清华大学联盟)的自主招生(AAA,或“高水平大学自主选拔学业能力测试”)。我通过了初试并被清华大学交叉信息研究院面试。这是一份面试的转录。

去 THU IIIS 面试