Seki Takakazu was a prominent Japanese mathematician during the Edo period, known for his contributions to the field of mathematics, particularly in the area of calculus. He is often regarded as one of the first to develop a form of calculus in Japan, independently of Western influences. His work laid the foundation for future mathematical studies in the country. Takakazu is best known for his method of Seki's calculus, which involved the use of infinite series and geometric interpretations. He also made significant advancements in number theory and algebra, influencing later mathematicians such as Kanzan Satō and Kōwa Seki. His legacy continues to be recognized in the history of mathematics in Japan.