In mathematics, a group is a set that has something called multiplication. The set of numbers is an example. Because groups can have anything that should be called multiplication, they appear in many situations. In fact, groups are one of the essential concepts for understanding various mathematics. Fourier expansion, on the other hand, is a method of representing a function on a number line by superimposing trigonometric functions of different periods, and is an interesting topic both mathematically and practically. In this lecture, I will introduce some aspects of the study of group theory, starting with the relationship between groups and Fourier expansions.

NOTE:
- This lecture was conducted only in Japanese.

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