Tsung-san Mou talks about logic in some of his works, we only focus on several questions that Mou introduces from Whitehead and Russell's Principia Mathematica. One of the questions is that Mou misunderstands the distinction between the extensional functions and the intensional functions as the distinction between the internal meaning and external meaning of propositions. We have good reasons to believe that Mou does not know what Whitehead and Russell talk about a function of a function. Another question is that Mou misunderstands what is formal implication. Whitehead and Russell explain that formal implication is the implication always hold in the scope of a universal quantifier. Mou does not care about what the scope of a universal quantifier is, he only talks about the implication between two functions. What Mou says is the material implication, not the formal implication.

Lewis, Clarence Irving (1918). A Survey of Symbolic Logic. Berkeley: University of California Press

Google Scholar

Whitehead, Alfred N. and Russell, Bertrand (1910). Principia Mathematica, Volume 1. Merchant Books

Google Scholar

李明輝（1996）。 牟宗三先生的哲學詮釋中之方法論問題 。 中國文哲研究集刊 ， (8)，175-195。https://doi.org/10.6351/BICLP.199603.0175

李瑞全（2004）。 牟宗三先生之邏輯哲學 。 鵝湖月刊 ， (348)，18-29。https://doi.org/10.29652/LM.200406.0005

蔡仁厚（2009）。 牟宗三先生對「中國哲學史」的通解與表述 。 鵝湖月刊 ， (414)，8-14。https://doi.org/10.29652/LM.200912.0003

汪文聖（2016）。 重新審視牟宗三的〈道德判斷與歷史判斷〉－從現象學的觀點來看 。 中央大學人文學報 ， (62)，49+51+53-78。https://www.airitilibrary.com/Article/Detail?DocID=19939167-201610-201703070012-201703070012-49+51+53-78

蔡仁厚（2002）。 Preface to Li Shen's "An Biography of Mou Tsung-san" 。 鵝湖月刊 ， (323)，24-24。https://doi.org/10.29652/LM.200205.0004