Simplicius : on Aristotle on the heavens 3.7-4.6 by Simplicius, Ian Mueller

By Simplicius, Ian Mueller

Commenting at the finish of Aristotle On the Heavens e-book three, Simplicius examines Aristotle's criticisms of Plato's conception of elemental chemistry within the Timaeus. Plato makes the features of the 4 components rely on the shapes of part corpuscles and finally at the association of the triangles which compose them. Simplicius preserves and criticizes the contributions made to the controversy in misplaced works by way of different significant commentators, Alexander the Aristotelian, and Proclus the Platonist. In ebook four, Simplicius identifies fifteen objections by way of Aristotle to Plato's perspectives on weight within the 4 parts. He finishes ebook four by means of elaborating Aristotle's criticisms of Democritus' conception of weight within the atoms, together with Democritus' feedback in regards to the impression of atomic form on yes atomic motions.

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305b31) Now if they come to be by reshaping, it follows necessarily that they must say that bodies are indivisible, since if they were divisible, a part of fire would not be fire nor would a part of earth be earth, since a part of a pyramid is not always a pyramid] and a part of a cube is not always a cube. With separation out having been eliminated remains that the elements come to be from one another because of changing into one another. For if they come to be from one another it is necessary either that one be separated out from the other, each being actual (and this is not even coming to be in the strict sense but only apparent coming to be), or that that from which there is coming to be changed into the result.

And this too is also reshaping, albeit not the shaping of one continuous substratum but of several things which are combined together. It is clear that there is also a third way in which elements come to be from one another because of changing, the one which Aristotle accepts. This is not because of change of shapes but because of change of other qualities called active, namely heat, coldness, dryness, and moistness, from which the other qualities are derived. He first argues against the reshaping as the reconfiguration of a single substratum, and it seems that this way of coming to be is put forward for consideration on the basis of what is said in the Timaeus.

Alexander sets them out using another kind of diagram in the following way: If we describe a hexagon ABCDEF and on the side CD we describe a hexagon CDGHIK similar to it, the angle contained by BCK is also itself four thirds , as are the angles about the point C of the two hexagons which have been described. For since the three angles are equal to four right angles, that is, to twelve thirds , and each of the two is four thirds, therefore the remaining angle will be four thirds.

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