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De corpore


De Corpore ("On the Body") is a 1655 book by Thomas Hobbes. As its full Latin title Elementorum philosophiae sectio prima De corpore implies, it was part of a larger work, conceived as a trilogy. De Cive had already appeared, while De Homine would be published in 1658. Hobbes had in fact been drafting De Corpore for at least ten years before its appearance, putting it aside for other matters. This delay affected its reception: the approach taken seemed much less innovative than it would have done in the previous decade.

Although the chosen title would suggest a work of natural philosophy, De Corpore is largely devoted to foundational matters. It consists of four sections. Part I covers logic. Part II and Part III concern “abstract bodies”: the second part is a repertoire of scientific concepts, and the third of geometry. The Chapters 16 to 20 of Part III are in fact devoted to mathematics generally, in a reductive way, and proved controversial. They proposed a kinematic foundation for geometry, which Hobbes wished to equate with mathematics; geometry itself, that is, is a “science of motion”. Hobbes here adopts ideas from Galileo and Cavalieri. It is in Part IV, on natural phenomena, that there is discussion of physics as such.

Hobbes in De Corpore states that the subject of philosophy is devoted to "bodies". He clarifies this by division: in English translation, natural philosophy is concerned with concept of "natural body" (Latin: corpus naturale), while the bodies called commonwealths are the concern of "civil philosophy". He then applies "body" as synonymous with substance, breaking with the scholastic tradition.

Some proofs in the work being "botched", as Noel Malcolm puts it, De Corpore had a negative effect on Hobbes's scholarly reputation. The inclusion of a claimed solution for squaring the circle, an apparent afterthought rather than a systematic development, led to an extended pamphlet war in the Hobbes-Wallis controversy


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