Logician

There were no actual formal schools at the time but rather a wide spectrum of individual thinkers who included Mencius (Pacifist and Confucianist philosopher), Sun Tzu (military strategist), Mo Ti (aka Mozi, military engineer and philosopher), Hui Shi (Logician) and Gongsun Longzi (Logician).

He was the century’s preeminent logician, the logician whose discoveries made it impossible ever to think of logic in the same way.

It is interesting to note that he was the first mathematical logician to hold a chair at a British University and he exercised an important influence on the development of this topic in the UK [1]:-

Peirce was an innovator in many fields, including philosophy of science, epistemology, metaphysics, mathematics, statistics, research methodology, and the design of experiments in astronomy, geophysics, and psychology, but he considered himself a logician first and foremost (he was perhaps the leading logician in the world at that time).

Following the tradition established by G. Frege, the author of the first fundamental studies on logical semantics, by the Austrian logician R. Carnap, and by the contemporary American logician A. Church, each proper noun (including, in the broad sense of the term, cardinal numbers and any nouns with definite articles or demonstrative pronouns) is contrasted with, on the one hand, its denotative object (denotation, or nominatum) and, on the other, the sense, or concept expressed by the noun.