This talk concerns an invariant of generalized (co)homology theories. Its value lies in the second monoidal cohomology of cobordism (more generally, cospan) categories. After deriving this invariant by using homological algebra, we give another construction which is inspired by a finite version of Feynman’s path integral. We also give a brief review of finite path integral in this context. 강연시간 : 16:40 - 17:10