Can one deny the intelligibility of “extramental nonbeing” in pure ontology while affirming its intelligibility in physics? When one sweeps the heavens clean of matter does one also necessarily affirm the existence of absolute nonbeing in those “clean” spaces? Does talking about space necessarily mean talking about nonbeing? How could there possibly be “space” which is not absolute nothingness? How, if at all, can statements about space be reconciled with such self-contradictory statements as “What is not, is“?The purpose of this (...) brief paper is not to argue, within the context of the physical sciences, about whether or not there exist voids or absolutely empty spaces in the universe. Neither is it to discuss the existence or nonexistence of the aether. And although I shall be using texts taken from several famous historical figures, my purpose is not primarily historical. (shrink)

Making a history of the principle of inertia, as of any other principle or concept, is a complex but still possible operation. In this work it has been chosen to make a back story which seemed the most natural way for a reconstruction. On the way back, it has been decided to stop at the 6th century CE with the contribution of Ioannes Philoponus. The principle he stated, although very different from the modern one, is certainly associated with it. Going (...) back in time it is still possible and of course one could proceed to the origins of the homo sapiens who perhaps posed the problem of why a club thrown with his hand could go so far from him. But the similarities that one can find with the modern principle are very vague, too perhaps. Without going so far one could see an embryonic idea of the principle of inertia in the atomistic theory of Democritus in the 5th century BCE. The motion of atoms whirling with no apparent reason can suggest the idea that a body can also move with no reason. But the transition from the atom, a metaphysical being, to the body, an empirical being, is far from immediate. (shrink)

An oft-cited truism about the emergence of a new, ‘mechanistic’ approach to natural philosophy in the seventeenth century is that it was inspired by analogy to the workings of clockwork. In Authori...

A discussion of Lloyd's Tarner Lectures at Trinity College. The importance of Lloyd's previous scholarship is characterized and these sweeping, erudite lectures are placed in the context of that scholarship. In the broadest terms, the lectures are a call to culturally and historically comparative study of human reasoning. At their heart is a comparative history of scientific theorizing from the ancients through to modern science. Lloyd rejects the positivist picture, and the view of modern and ancient science as discontinuous; he (...) urges scholars to undertake comparative work on the ancient sciences in different traditions. This critical notice evaluates Lloyd's view and raises several questions for further reflection. (shrink)

: We question the claim, common since Duhem, that sixteenth century astronomy, and especially the Wittenberg interpretation of Copernicus, was instrumentalistic rather than realistic. We identify a previously unrecognized Wittenberg astronomer, Edo Hildericus (Hilderich von Varel), who presents a detailed exposition of Copernicus's cosmology that is incompatible with instrumentalism. Quotations from other sixteenth century astronomers show that knowledge of the real configuration of the heavens was unattainable practically, rather than in principle. Astronomy was limited to quia demonstrations, although demonstration propter (...) quid remained the ideal. We suggest that Osiander's notorious preface to Copernicus expresses these sixteenth century commonplaces rather than twentieth century instrumentalism, and that neither `realism', nor `instrumentalism', in their modern meanings, apply to sixteenth century astronomy. (shrink)

The position on the question of divine providence of the Aristotelian commentator Alexander of Aphrodisias (fl. c. A.D. 200) is of particular interest. It marks an attempt to find avia mediabetween the Epicurean denial of any divine concern for the world, on the one hand, and the Stoic view that divine providence governs it in every detail, on the other.2As an expression of such a middle course it finds a place in later classifications of views concerning providence.3It is also of (...) topical interest: Alexander's fullest discussion, in his treatiseDe providentia (On Providence)(surviving only in two Arabic versions), has only recently been edited and translated,4although some aspects of his position had long been known from other texts preserved in Greek.5. (shrink)

The model of a closed linear measure space, which can be used to model Aristotle’s treatment of motion (kinesis), can be analogically extended to the qualitative ‘spaces’ implied by his theory of contraries in Physics I and in Metaphysics Iota, and to the dimensionless ‘space’ of the unity of matter and form discussed in book Eta of the Metaphysics. By examining Aristotle’s remarks on contraries, the subject of change, continuity, and the unity of matter and form, Aristotle’s thoughts on motion, (...) on contraries, and on the unity of substance can be brought together under a single interpretive framework, which can provide an approach to interpreting his ontology. (shrink)

Journal Name: Apeiron Issue: Ahead of print.

It is commonly held that Theophrastus criticized or rejected Aristotle's account of place. The evidence that scholars put forward for this view, from Simplicius' commentary on Aristotle's Physics, comes in two parts: (1) Simplicius reports some aporiai that Theophrastus found for Aristotle's account; (2) Simplicius cites a passage of Theophrastus which is said to 'bear witness' to the theory of place which Simplicius himself adopts (that of his teacher Damascius) — a theory which is utterly different from Aristotle's. But the (...) aporiai have relatively straightforward solutions, and we have no reason to suppose that Theophrastus didn't avail himself of them (and some reason to think that he did). Moreover, the text which Simplicius cites as bearing witness to Damascius' view on closer inspection does not seem to be inconsistent with Aristotle's account of place or natural motion. (shrink)

‘Saving the appearances’, , is a slogan that, in its time, stood or was made to stand for many different methodological positions in many different branches of ancient natural science. It is not my aim, in this paper, to attempt to tackle the subject as a whole. I shall concentrate on just one inquiry, astronomy. Nor, with astronomy, can I do justice to all the complexities of what was certainly one of the central methodological issues, if not the central issue, (...) in the history of ancient theoretical astronomy. I have a quite limited aim, to examine the foundations, and test the applicability, of a widespread and influential line of interpretation of ancient Greek astronomy according to which it was essentially, or at least predominantly, what we may call ‘instrumentalist’ in character—that is, broadly speaking, that Greek astronomical theories were devices or fictions put forward purely for the sake of calculations with no claims to correspond with physical reality. (shrink)

The ArgumentIt was commonly accepted in the middle ages that void within or outside the world is impossible. The paper presents a quite unusual conception of void, which is described in Yeda'aya ha-Penini's commentary on Ibn Rushd's epitome on Aristotle's Physics. According to this conception there is a thin layer of void between the water and the inner surface of the container. Ha-Penini describes two versions of this conception. According to one version this void layer is three-dimensional but thin, according (...) to the other it is two-dimensional. The first part of the paper shows how ha-Penini “corrects” the text of Ibn Rushd, putting into it ideas which were unknown to Ibn Rushd. It is argued that, though the two views are rejected by Ibn Rushd, ha-Penini himself partly accepts (his version of) these views. The second part of the paper argues that ha-Penini could not have found these views in the Arabic-Hebrew tradition, and it seems that he relied on Christian sources. If this is indeed so, the paper presents an example of acquaintance of Hebrew scholars in southern France with Scholastic science in the first half of the fourteenth century. (shrink)

One of the hardest questions to answer for a (Neo)platonist is to what extent and how the changing and unreliable world of sense perception can itself be an object of scientific knowledge. My dissertation is a study of the answer given to that question by the Neoplatonist Proclus (Athens, 411-485) in his Commentary on Plato’s Timaeus. I present a new explanation of Proclus’ concept of nature and show that philosophy of nature consists of several related subdisciplines matching the ontological stratification (...) of nature. Moreover, I demonstrate that for Proclus philosophy of nature is a science, albeit a hypothetical one, which takes geometry as its methodological paradigm. I also offer an explanation of Proclus’ view of what is later called the mathematization of physics, i.e. the role of the substance of mathematics, as opposed to its method, in explaining the natural world. Finally, I discuss Proclus’ views of the discourse of philosophy of nature and its iconic character. (shrink)