This article gives an overview of the mereological thought of the medieval philosopher and theologian Saint Thomas Aquinas. Until the 20th century mereology—the study of the relationship of whole and part—was not generally recognized as a distinct domain of philosophy and so Aquinas, like most of his contemporaries, has no single systematic treatment of it as a topic in its own right. However, a cohesive account of part‐whole relations can be pieced together from the various metaphysical, ethical and theological contexts in which Aquinas deals with mereological issues. In this article, I give an account of both Aquinas's conceptual understanding of composition and his taxonomy of the different kinds of wholes and parts that there are. I end with comments on three marginal cases of mereological relationships in Aquinas's philosophy.

中文翻译：

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托马斯·阿奎那的思想

本文概述了中世纪哲学家和神学家圣托马斯·阿奎那的思想论思想。直到20世纪，对整体性和部分性关系的研究才被普遍认为是哲学的一个独特领域，因此，阿奎那像他的大多数同时代人一样，本身就没有一个系统地将其作为一个主题来对待的问题。 。但是，可以从阿奎那处理单调问题的各种形而上学，伦理学和神学背景中，对整体关系的内在联系进行整合。在本文中，我将介绍阿奎纳斯对构成的概念性理解以及他对存在的各种不同整体和部分的分类学。最后，我对阿奎纳斯哲学中的三种边际关系进行了评论。