What’s considered trendy today will most likely be old-fashioned in 10 years. However, studying in the Department of Mathematics is not one of them. Mathematics theorems retain the same value today as they were proven over 2,000 years ago. Some theorems have even increased their values thanks to the development of new science and technology. The basics of information technology are supported by number theory and discrete mathematics, and the knowledge of statistical science and probability theory is indispensable for analyzing massive amounts of data.

By learning such universally valuable studies, you can build a solid foundation of your perspective and worldview. This foundation includes many seeds of ideas that can be useful in society. We welcome not only those who want to pursue mathematics as an academic study but also those who wish to apply mathematical thought in society. What you earn here is highly valued in various fields of society.

There are various universities, including national universities, with a Department about Mathematical sciences today, but Keio University was the first in Japan to establish this department. Mathematical sciences refer to a wide range of academic fields from so-called pure mathematics to academic fields that apply mathematics. We carry out various fields of educational research in order to cultivate students who apply such skills to a wide range of fields. For example, we are well known for the fields of differential equation theory, geometry, probability and ergodic theory, number theory, discrete mathematics, computational mathematics, and statistical sciences. Furthermore, our department is distinct in that these various studies are organically linked.

Have you ever spent a long time trying to solve a math problem? If you could luckily solve it, the joy you felt must have been exceptional. Real math is neither memorizing formulas nor memorizing problem patterns. It's important to take your time and think through it. The time you spend while being stuck on a problem will not be wasted, and the learning you gain only through this process will become a great asset to you. If you are one who likes to ponder over things until you are fully satisfied or one who loses track of time when sitting in front of a computer, you are a good candidate for the Department of Mathematics. Also, there is a diverse pool of students in our department. This diversity is necessary, because mathematical sciences is the science that studies mathematical nature, which is as diverse as ordinary nature.