Howard Spodek’s The World’s History was originally published in 1998, and the 5th edition was published in 2014. Notes on Preface History should provide us with wisdom to better understand the pr...

Here are my notes on “Chapter 1. Introduction” of The Ruby Programming Language by David Flanagan and Yukihiro Matsumoto. The first impression of Ruby: dynamic, a complex but expressive grammar, p...

《微积分入门》是小平邦彦（1915–1997）晚年创作的一部微积分教材。其原著名为《解析入門》，翻译为《微积分入门》估计是为了顺应国内的称呼。 微积分，或者数学分析，是高等数学的大门，是物理学的基础。我在三十多岁选择复习微积分，是为了重新回到数理世界，回到我曾经为之努力过又中途放弃的事业。我不知道以如此“高龄”再一次以学生的身份踏入这条道路最终能走向何方，但我愿意走一步看一步。这一次不再离...

The Ruby Programming Language: Everything You Need to Know written by David Flanagan and Yukihiro Matsumoto was published in 2008. I read this book because I want to learn Ruby. I learn Ruby becau...

Even before the explosion of GPTs, blogs already seemed to be dying. Now, the situation is worse. GPTs are now absorbing a large portion of web traffic. Someone once said that blogging in the AI er...