An Absurd Accumulation: Metaphysics M.2, 1076b11-36

In: Phronesis
Author: Emily Katz1
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  • 1 Department of Philosophy, Michigan State University, South Kedzie Hall, 368 Farm Lane, Room 503, East Lansing, MI 48824, USA

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The opening argument in the Metaphysics M.2 series targeting separate mathematical objects has been dismissed as flawed and half-hearted. Yet it makes a strong case for a point that is central to Aristotle’s broader critique of Platonist views: if we posit distinct substances to explain the properties of sensible objects, we become committed to an embarrassingly prodigious ontology. There is also something to be learned from the argument about Aristotle’s own criteria for a theory of mathematical objects. I hope to persuade readers of Metaphysics M.2 that Aristotle is a more thoughtful critic than he is often taken to be.

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  • 1

    Paul Natorp (2004) writes that the first argument ‘deserves to be paraded in all its foolishness as one of the crassest pieces of evidence for the naivety with which Aristotle tried to make clear to himself the being-in-itself of the ideas’ (384), and Julia Annas (1976) objects that the argument makes ‘anti-platonist assumptions’ (141), and that Aristotle characterizes his opponents’ view somewhat crudely. Ross attributes an asymmetry in the argument to Aristotle’s ‘carelessness’ (1924, 413). Hippocrates G. Apostle 1952 offers a detailed reconstruction of the argument, but his version produces many more sets of ideal mathematical objects than Aristotle claims to have produced in his final tally at 1076b29-33. (Apostle’s version generates seven sets of ideal lines and fifteen sets of ideal points, while Aristotle only claims to have generated four sets of ideal lines and five sets of ideal points.) Pettigrew 2009 discusses the argument in passing (242), but does not explain Aristotle’s difficult claims about the priority relations between the various ideal objects.

  • 18

    Like Annas, Ross and others, Crubellier 1994, 92 takes ἀσύνθετος to mean ‘incomposite’, and so he takes Aristotle to be comparing one ideal geometrical object of n dimensions to prior geometrical objects of < n dimensions (e.g. a solid with prior planes). But these are not the objects Aristotle says he is comparing here with respect to their priority. He is comparing two kinds of ideal geometrical object, both of n dimensions, to one another.

  • 22

    See for example Proclus, In primum Euclidis elementorum librum commentarii 246.10-12 Friedlein: πολλὰ γὰρ ἀσύνθετα µὲν ὄντα οὐκ ἀναλύεται, συντεθέντα δὲ µόνως εὑοδίαν παρέχει πρὸς τὴν ἐπὶ τὰς ἀρχὰς ἀνάλυσιν (‘For often things left uncompounded do not lend themselves to analysis and only when put together provide an easy way of getting back to first principles’; trans. Morrow 1970, my emphasis). Here ἀσύνθετος2 is being paired and contrasted with σύγκειµαι2.

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  • 27

    See Cleary 1988, 87, who also argues that Aristotle takes priority in ousia to be a consequence of separation.

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