Albert

@iAlbertUCLA

graduated from UCLA.

Los Angeles

Joined May 2016

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接骨木利口酒

@Lapsang8964

2 days ago

来源《人民文摘》，等等，这确实是官方报道！

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Millie Marconi

@MillieMarconnni

2 days ago

A Chinese mathematician spent 7 years making sandwiches at Subway after his PhD, and at 58 solved a 150-year-old math problem nobody thought was solvable. His name is Yitang Zhang. The problem is called the Twin Prime Conjecture. He was born in Shanghai in 1955 and knew he wanted to spend his life on mathematics by the time he was nine years old. That year he found his own proof of the Pythagorean theorem. Nobody taught it to him. He just worked it out. Then the Cultural Revolution arrived and took everything. The Chinese government closed the schools. Zhang's father had political troubles with the Communist Party, so Zhang was sent to the countryside with his mother to work in the fields. He spent 10 years as a farm laborer. No high school. No classroom. No teacher. He read math books in the fields when he could find them. When the revolution ended, Zhang was 23. He sat the university entrance exam and got into Peking University, one of the most competitive mathematics programs in China. He finished his bachelor's degree, then a master's. The president of Peking University personally recommended him for a full scholarship at Purdue University in the United States. He arrived at Purdue in 1985. He earned his PhD in 1991. Then the second wall hit. His relationship with his doctoral advisor collapsed. The advisor did not write him letters of recommendation. Without those letters, the academic job market was closed. Zhang applied. Nothing came back. He spent the years after his PhD working as an accountant, doing delivery work, sleeping in his car during the stretches when nothing else was available. A friend eventually opened a Subway sandwich restaurant in Kentucky and offered him a job. Zhang took it. He kept the books and made sandwiches. A man with a PhD in mathematics from Purdue, working a Subway counter because the academic world had no place for him. He did this for seven years. He was finally hired as a lecturer at the University of New Hampshire in 1999. Not a professor. A lecturer. The lowest rung of the academic ladder, with no research funding, no graduate students, and no institutional support. He taught calculus to undergraduates and worked on mathematics alone in whatever time was left. Most people would have stopped believing by then. Zhang did not stop. The Twin Prime Conjecture is one of the oldest unsolved problems in number theory. Twin primes are pairs of prime numbers separated by exactly two: 5 and 7, 17 and 19, 41 and 43. The conjecture predicts that these pairs never stop appearing no matter how far you go along the number line. Mathematicians had believed this for over 150 years. Nobody had been able to prove it. The deeper version of the problem asks something slightly different. Not whether twin primes are infinite, but whether there is any finite gap between prime numbers that appears infinitely often. This is called the bounded gap problem. The best mathematicians in analytic number theory had been attacking it for decades. A landmark 2005 paper by three researchers came agonizingly close and still could not close it. Zhang worked on it alone. No collaborators. No funding. No department seminars where he could road-test his ideas. He once said he would go to a friend's house and think in the garden for hours. In 2012, during a visit to a friend's home in Colorado, something unlocked. He submitted his paper to the Annals of Mathematics in April 2013. The Annals is the most prestigious mathematics journal in the world. Papers sit in review for months, sometimes years. The editors read Zhang's submission and immediately knew something was different. They sent it to the leading experts in analytic number theory for review. It was accepted in three weeks. The paper proved that there are infinitely many pairs of prime numbers separated by a gap of less than 70 million. Not two. Not the twin prime gap specifically. But a finite gap. For the first time in history, someone had proved that prime numbers keep coming back together, that the universe of numbers never lets them drift apart forever. Peter Sarnak, one of the most respected mathematicians at the Institute for Advanced Study, said: "He is not a fellow who had done much before. Nobody knew him. His result was spectacular." Zhang was 58 years old. Within a year he had the MacArthur Fellowship, the Cole Prize, the Rolf Schock Prize, and a full professorship at UC Santa Barbara. The man who spent seven years at Subway was now one of the most celebrated mathematicians alive. He said in an interview: "I was not lucky. Maybe it is more important for a person to make himself known to the public. But that was not so easy for me." He was not complaining. He was just being precise. The mathematics establishment has a quiet belief that great work happens young. The Fields Medal cuts off at 40. Most mathematicians who change the field do it in their thirties. Zhang proved his most important theorem at 58, after a decade of farm labor, seven years of sandwiches, and a decade of teaching calculus to freshmen with no one watching. He did not beat the deadline. He proved there was no deadline to beat.

MillieMarconnni's tweet photo. A Chinese mathematician spent 7 years making sandwiches at Subway after his PhD, and at 58 solved a 150-year-old math problem nobody thought was solvable.

His name is Yitang Zhang. The problem is called the Twin Prime Conjecture.

He was born in Shanghai in 1955 and knew he wanted to spend his life on mathematics by the time he was nine years old. That year he found his own proof of the Pythagorean theorem. Nobody taught it to him. He just worked it out.

Then the Cultural Revolution arrived and took everything.

The Chinese government closed the schools. Zhang's father had political troubles with the Communist Party, so Zhang was sent to the countryside with his mother to work in the fields. He spent 10 years as a farm laborer. No high school. No classroom. No teacher.

He read math books in the fields when he could find them.

When the revolution ended, Zhang was 23. He sat the university entrance exam and got into Peking University, one of the most competitive mathematics programs in China. He finished his bachelor's degree, then a master's. The president of Peking University personally recommended him for a full scholarship at Purdue University in the United States.

He arrived at Purdue in 1985. He earned his PhD in 1991.

Then the second wall hit.

His relationship with his doctoral advisor collapsed. The advisor did not write him letters of recommendation. Without those letters, the academic job market was closed. Zhang applied. Nothing came back. He spent the years after his PhD working as an accountant, doing delivery work, sleeping in his car during the stretches when nothing else was available.

A friend eventually opened a Subway sandwich restaurant in Kentucky and offered him a job. Zhang took it. He kept the books and made sandwiches. A man with a PhD in mathematics from Purdue, working a Subway counter because the academic world had no place for him.

He did this for seven years.

He was finally hired as a lecturer at the University of New Hampshire in 1999. Not a professor. A lecturer. The lowest rung of the academic ladder, with no research funding, no graduate students, and no institutional support. He taught calculus to undergraduates and worked on mathematics alone in whatever time was left.

Most people would have stopped believing by then.

Zhang did not stop.

The Twin Prime Conjecture is one of the oldest unsolved problems in number theory. Twin primes are pairs of prime numbers separated by exactly two: 5 and 7, 17 and 19, 41 and 43. The conjecture predicts that these pairs never stop appearing no matter how far you go along the number line. Mathematicians had believed this for over 150 years. Nobody had been able to prove it.

The deeper version of the problem asks something slightly different. Not whether twin primes are infinite, but whether there is any finite gap between prime numbers that appears infinitely often. This is called the bounded gap problem. The best mathematicians in analytic number theory had been attacking it for decades. A landmark 2005 paper by three researchers came agonizingly close and still could not close it.

Zhang worked on it alone. No collaborators. No funding. No department seminars where he could road-test his ideas. He once said he would go to a friend's house and think in the garden for hours.

In 2012, during a visit to a friend's home in Colorado, something unlocked.

He submitted his paper to the Annals of Mathematics in April 2013. The Annals is the most prestigious mathematics journal in the world. Papers sit in review for months, sometimes years. The editors read Zhang's submission and immediately knew something was different. They sent it to the leading experts in analytic number theory for review.

It was accepted in three weeks.

The paper proved that there are infinitely many pairs of prime numbers separated by a gap of less than 70 million. Not two. Not the twin prime gap specifically. But a finite gap. For the first time in history, someone had proved that prime numbers keep coming back together, that the universe of numbers never lets them drift apart forever.

Peter Sarnak, one of the most respected mathematicians at the Institute for Advanced Study, said: "He is not a fellow who had done much before. Nobody knew him. His result was spectacular."

Zhang was 58 years old.

Within a year he had the MacArthur Fellowship, the Cole Prize, the Rolf Schock Prize, and a full professorship at UC Santa Barbara. The man who spent seven years at Subway was now one of the most celebrated mathematicians alive.

He said in an interview: "I was not lucky. Maybe it is more important for a person to make himself known to the public. But that was not so easy for me."

He was not complaining. He was just being precise.

The mathematics establishment has a quiet belief that great work happens young. The Fields Medal cuts off at 40. Most mathematicians who change the field do it in their thirties. Zhang proved his most important theorem at 58, after a decade of farm labor, seven years of sandwiches, and a decade of teaching calculus to freshmen with no one watching.

He did not beat the deadline.

He proved there was no deadline to beat.

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杂学大师✨

@Techbruneth

2 days ago

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Albert @iAlbertUCLA

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@jiamibtc 你爸不爱你妈，但是爱你

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徐老猫

@raycat2021

4 days ago

贝佐斯：创始人的工作是打造一家“厚重”的公司亚马逊股价在互联网泡沫破裂时从113美元跌落至6美元。 “股东不安；员工紧张；他们的父母打电话过来，问他们是否还好。一个极度紧张的时刻。但我查了业务数据，每个月客户数在增加，毛利润在增加，每一个业务指标在持续改善。” “企业家要专注于业务根本，股价是一个我们无法控制的最终产出。格雷厄姆说过，短期内股市是投票机，长期内是称重机。作为企业家，我们的工作是打造一家厚重的公司，不要去理会股价，那样做会产生误导，因为「股价」可能与基本面脱节。”

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小弟调调

@jaywcjlove

4 days ago

"I never give up" 致敬生活中，永不放弃的你

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杨佩昌

@peichang_yang

5 days ago

不知道是哪位总结的，挺有意思： - 当一个右翼人士不是猎人并且不喜欢枪支时，他不去打猎，也不购买枪支。 - 当一个左翼人士不是猎人并且不喜欢枪支时，他要求禁止狩猎和枪支销售。 - 当一个右翼人士是素食主义者时，他不吃肉。 - 当一个左翼人士是素食主义者时，他发起反对肉类食物的运动，并希望禁止吃肉。 - 当一个右翼人士是同性恋时，他过着正常的生活。 - 当一个左翼人士是同性恋时，他宣扬同性恋，参加“同性恋骄傲”游行，��指责所有与他想法不同的人为“恐同者”。 - 当一个右翼人士失业时，他会思考如何摆脱困境，并尽一切努力寻找新工作。 - 当一个左翼人士失业时，他会去工会抱怨，耗尽最后一天的时间，参加所有针对右翼和企业家的示威和罢工。 - 当一个右翼人士不喜欢某个电视节目时，他会换台或关掉电视。 - 当一个左翼人士不喜欢某个电视节目时，他会抱怨并在报纸、电台、电视台上举报，加入某个左翼政党来推动一项事业，以期彻底关闭播放该节目的电视频道。 - 当一个右翼人士是无神论者时，他不去教堂。 - 当一个左翼人士是无神论者时，他嘲笑并迫害所有相信上帝的人，举报任何在学校或机构中展示十字架的地方，反对任何宗教身份象征，要求没收教会财产，禁止圣周以及每一次游行或朝圣活动（他对伊斯兰教什么都不做，因为他没有那个勇气）。 - 当一个右翼人士遇到经济困难时，他会寻找工作赚钱更多的方法，或者试图找到资金来偿还债务，如果可能的话，他会储蓄。 - 当一个左翼人士遇到经济困难时，他会把责任推给右翼、企业家、资产阶级、资本主义、新保守主义者等等，然后联系工会，希望之后能被拉入某个政党或相关地方。 -当一个��翼人士面对不同观点、取向以及信仰时，会选择阐述自己的观点、取向、信仰，同时聆听对方的不接受以及反驳。 -当一个左翼人士遇到不接受和反驳时，会选择继续“规劝”，把拒绝接受他们“规劝”的列为敌人。 - 当一个右翼人士读到这篇文章时，他会笑起来，如果有心情的话，会发给他的朋友。 - 当一个左翼人士读到这篇文章时，他会勃然大怒，把写下并发送这篇文章的人称为法西斯主义者和落后分子。只需补充一点：一个右翼人士追求自己的幸福；一个左翼人士追求毁掉他人的幸福。

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Szymanski

@Szymansk_ii

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Next time you think of giving up, remember this photo of Elon in 2008.

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@imkkwoo 苏联男人

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无语

@imkkwoo

6 days ago

勃列日涅夫让邮政部发行了带自己头像的邮票。一个月后，他问部长：“邮票卖得怎么样？” 部长说：“大家都抱怨邮票不粘信封。” 勃列日涅夫说：“不粘？我看看。” 他拿起一张邮票，往背面吐了口唾沫，啪地按在桌上。 “这不是挺粘的吗？” 部长沉默了一下，说： “问题是，大家吐的是另一面。”

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链上小财女

@Zoozo2025

6 days ago

震撼一幕！索尼 AI 乒乓球机器人 Ace，在正式乒联规则下，击败了世界排名前 26 的日本名将木原美悠。

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Albert @iAlbertUCLA

6 days ago

@igeekbb 在公司里，叫你个王总，出了公司，老王是谁

iAlbertUCLA retweeted

朱韵和

@zhu0588

8 days ago

1927年，鲁迅先生由广东返回上海，最初他没有想在上海长期居住的打算。所以也就没有购置餐厨设备。每天吃的饭都是“外卖”，由饭店做好送到他的住处，每隔10天结算一次。这份菜谱，一日不落地记录了鲁迅自1927年11月至1928年6月这7个月的伙食。这几个月三餐，是请当时的沪上某大饭店定做的。夫妻俩吃了六七个月“外卖”，但这外卖质量可不低。每一顿，至少有三菜一汤，两荤一素，而且基本不重复，从没降低过标准。在这份菜单上不仅可以看到他每天吃了什么，还能看到大约每天的饭钱是多少。 ---菜单来自：《鲁迅家用菜谱》（1/2）

zhu0588's tweet photo. 1927年，鲁迅先生由广东返回上海，最初他没有想在上海长期居住的打算。所以也就没有购置餐厨设备。每天吃的饭都是“外卖”，由饭店做好送到他的住处，每隔10天结算一次。这份菜谱，一日不落地记录了鲁迅自1927年11月至1928年6月这7个月的伙食。
这几个月三餐，是请当时的沪上某大饭店定做的。
夫妻俩吃了六七个月“外卖”，但这外卖质量可不低。每一顿，至少有三菜一汤，两荤一素，而且基本不重复，从没降低过标准。
在这份菜单上不仅可以看到他每天吃了什么，还能看到大约每天的饭钱是多少。
---菜单来自：《鲁迅家用菜谱》
（1/2）

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iAlbertUCLA retweeted

Tim Cook

@tim_cook

8 days ago

The next generation of Apple Intelligence powers an entirely new Siri: making the apps and experiences you rely on across iPhone, iPad, Mac, and Apple Vision Pro more personal and helpful than ever.

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Ronit Pereira

@CAronitpereira

12 days ago

Charlie Munger on the origins of Chinese-Americans 🇺🇸 🇨🇳 “The Chinese first came in USA trying to build the Sierra, trans-continental railroad in the winter.” “Our people were dying and it was just impossible, so they brought in 50,000 Chinese coolies, who were in those days practically slaves.” “They took the coolies in the mountains and said - you build the railroads and they did it! The Americans couldn’t do it by themselves.” “Fade in fade out 150 years later, due to immigration, these asians have rapidly become Doctors, Lawyers, Businessmen and succeeded mightily.” “Every instrument that’s hard to play in symphony orchestra, is played by a Chinese face.” - Charlie Munger. 2019