Introduction: “Proper Measure”—In Memoriam of Li Zehou

In Li Zehou’s philosophy, “proper measure” is the “first category.” It reflects the process and level of “sedimentation,” which defines the former, a particular type of mathematic shu in Chinese Mathematical Philosophy. Through the lens of “sedimentation,” we explore a new perspective to examine Li’s theories, such as his creative combination of Marxism, Kantianism, and Confucianism, his three “constructivist assumptions,” “Subjectality,” “emotion as substance,” and various forms of humanism. It is argued that the concept of “proper measure” can only be properly defined and interpreted in the context of the Chinese mathematical philosophy and is the underlying thread in Li’s theories and unique perspectives.