We all know Fermat's theorem on sums of two squares which is appreciated as the pearl of mathematics in the XVII – XVIII that concerns primes that are sums of two squares. But how about the other natural numbers? How can we know if a natural number a can write under the form of two square numbers? This book will help you find out more about this problem. Xin lỗi! Đây là cuốn ebook mà mình muốn gởi tới các bạn link file (66,36 KB): Vui lòng đăng nhập hoặc đăng ký để xem link