Writings
Of his reputedly numerous writings, only his commentary on Aristotle's De Interpretatione survives intact. A commentary on Porphyry's Isagoge may also be his, but it is somewhat corrupt and contains later interpolations.
In De Interpretatione, Ammonius contends that divine foreknowledge makes void the contingent. Like Boethius in his second Commentary and The Consolation of Philosophy, this argument maintains the effectiveness of prayer. Ammonius cites Iamblichus who said knowledge is intermediate between the knower and the known, since it is the activity of the knower concerning the known.
In addition, there are some notes of Ammonius' lectures written by various students which also survive:
- On Aristotle's Categories (anonymous writer)
- On Aristotle's Prior Analytics I (anonymous writer)
- On Aristotle's Metaphysics 1-7 (written by Asclepius)
- On Nicomachus' Introduction to Arithmetic (written by Asclepius)
- On Aristotle's Prior Analytics (written by John Philoponus)
- On Aristotle's Posterior Analytics (written by John Philoponus)
- On Aristotle's On Generation and Corruption (written by John Philoponus)
- On Aristotle's On the Soul (written by John Philoponus)
He was also an accomplished astronomer; he lectured on Ptolemy and is known to have written a treatise on the astrolabe.
Read more about this topic: Ammonius Hermiae
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