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Work · Ancient Greek

Physics

c. 350 BCE · by Aristotle

Motion, time, place and the four causes.

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Introduction

Eight books based on Aristotle’s lectures; the Greek title means roughly “lecture course on nature”. Nature (physis) is defined as an inner principle of motion and rest, which distinguishes natural things from artefacts. Book II introduces the four causes and defends purpose in nature; Book IV analyses place, void, whose existence Aristotle denies, and time, which he defines as the number of motion with respect to before and after. Later books discuss Zeno’s paradoxes and conclude that all motion depends on a first, unmoved mover. Until the seventeenth century the work set the framework for European and Islamic natural philosophy.

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