Hello. I am Septsea. I am a player of mathematics.

I am currently a member of "la Determinantularo", the group of persons who maintain and promote An introduction to determinants, which is expected to be a book that introduces determinants to beginners in an elementary, easy manner. It is certainly not my most important or most urgent thing, but I did invest some money, some time and some effort. I do not really make money. I just want that this book be read by more persons. I admit that this book is now in the Chinese language only, and I want to translate this book into English (based on which I will probably translate this book into another language), but it is bad that these days I do not have much spare time. I wish good luck to this book.

It is hoped that I will have enough money to promote this book. I am saving money.