Hoạt động trong tuần

Thời gian: 9h00, Thứ 4, Ngày 11/4/2018
Địa điểm: Phòng seminar tầng 5 nhà A6, Viện Toán học
Tóm tắt: Fermat's little theorem states that if $p$ is a prime number, then $a^p equiv a$ (mod $p$) holds true for any integer $a$. One may ask what happens when $p$ is not a prime. The answer to this question seems little known to mathematicians, even to number theorists (as Dickson said in his History of the Theory of Numbers). In this talk, we discuss the missing result which is essentially due to Gauss and its generalizations.