Abstract
Yasundo Takahashi (1912-1996) was a professor of mechanical engineering at the University of California, Berkeley, from 1958 until his retirement in 1979, where he developed novel control methods and spread knowledge and technology in the field of control engineering to Japan. In his textbook “Introducing systems and control” (1968; in Japanese), he not only presented a general system with a combination of control target and controller, but, unlike almost all other textbooks, also presented text and figure showing the interaction of energy and material between a system and its environment. The aim of this paper is to consider from his biography and other writings why he could not refrain from presenting the peculiar notation and its significance in relation to the cognition of systems.
https://ror.org/01ta2g450 
