On Apri 16, Prof. Sebbar of Bordeaux University gave a talk titled `` Humbert Polynomials and the equation x^3+y^3+z^3-3xyz=1" at Mathematics Seminar in Kindai University. Not only specialists but also many graduate and undergraduate students attended the seminar.

On Apri 17, Prof. he gave a lecture for junior students of Math Department in English. In the beginning of the lecture, he gave a clear explanation of the Euler constants and finally he led the audience to the relation between the Euler constant and the Riemann hypothesis.