There is a long way to go through the infinitely small calculus. Good news comes from Amazon.

A piece of good news came from the Amazon website early this morning: we have completed the payment process for the J. Keisler monograph basic calculus (English version) order. The payment information is as follows:

Order No:C01-0149638-6849443

Transaction serial number:1357866561

Payment amount: $299.00

For average people, this is just a very common small thing. However, this book is of extraordinary significance for the majority of new students enrolled in Colleges and Universities this year. Because this book is a rare thing in China, there are only two "lone books" in the Peking University Library, and this book is not lent out. So far, the Amazon bookstore only has this one. This book finally falls into our hands.

I remember that, more than thirty years ago, this book (university textbooks) was taken back to China by a foreign friend from the United States. It was very expensive (because it was a lone book) and could only be circulated to each other. This book is based on an infinitely small calculus (calculus), which makes us very open-eyed and unknown. At that time, our hearts were shocked and excited by this book.

The concept of infinitesimal has existed in ancient times. From Archimedes, to laveniz and Euler, to A. Robinson in the 1960s s, they created an infinitely small calculus discipline and set up immortal historical achievements. No one can criticize this long development process.

With this book, we can manually input it into editable text files, instead of making it editable again for readers. Here, I would like to thank two little helpers, Xue Lili (Lily, Hua Yun Technology) in Shenzhen and Zhang Xiaofeng in Beijing (Capital Foreign Language Institute) for their hard work, manually input and manually proofread and edit this book.

The infinitely small calculus is not a philosophical theory. It is a rigorous mathematical theory. In calculus education, we must catch up with Russia and eventually surpass Russia. This is our goal.