冯契在20世纪70年代末80年代初已对中国古代逻辑及其相关问题进行了深入研究?他论证了中国古代有逻辑;援引逻辑思维的基本矛盾证成了逻辑多元论;认为中国古代较早发展了朴素的辩证逻辑而长期冷落形式逻辑;通过对“三物”论说的创造性诠释提出了以“类”“故”“理”为骨架的逻辑范畴体系;并对中国古代逻辑研究的方法论进行了系统反思?冯契的这些理论创获与方法论自觉对于深化中国古代逻辑研究具有重要的意义?

Feng Qi had made a thorough study of logic in ancient China during the late 1970s and early 1980s. He not only argues that there is logic in ancient China, but makes a justification for the pluralism of logic from the perspective of basic contradiction of logical thinking. Influenced by Joseph Needham, he holds that the ancient Chinese showed a constant tendency to develop naive dialectical logic rather than formal logic. By creatively interpreting the ancient discourse on ＂Three Things (三物)＂, he sketches a new system of logical categories which takes lei (类/class), gu (故/reason) and li (理/principle) as its basic skeleton. Besides these concrete studies, he also makes a systematic reflection on the methodological issues about the study of logic in ancient China. Feng Qi＇s such academic achievements will play an important role in the further study of logic in ancient China.