Dionysius of Cyrene

Dionysius of Cyrene (Greek: Διονύσιος ὁ Κυρηναῖος), lived c. 150 BC, was a Stoic philosopher and mathematician.

He was a pupil of Diogenes of Babylon and Antipater of Tarsus.

He was famed as a mathematician, and he is probably the Dionysius whose arguments are attacked by Philodemus in his book On Signs (Latin: De Signis),[1] where Dionysius is reported as arguing that the Sun must be very large because it reappears slowly from behind an obstruction.[2]

Notes

Allen, J., Inference from Signs: Ancient Debates about the Nature of Evidence, page 207. Oxford University Press. (2001).
Barnes, J., Pyrrhonism, Belief and Causation. Observations on the Skepticism of Sextus Empiricus, p. 2661-2662, in Aufstieg und Niedergang der römischen Welt:: Geschichte und Kultur Roms im Spiegel der neueren Forschung. ed. Werk, Vogt, Haase, Temporini. Walter de Gruyter. (1997).

gollark: Your name is not mark. it is andrew.

gollark: Anyway, yes, half my online accounts are in fact named based on some aliens in some very good maths-for-children books I read.

gollark: No, Devon California.

gollark: http://www.murderousmaths.co.uk/games/ufoattack/zappan.gif

gollark: http://www.murderousmaths.co.uk/games/ufoattack/dbgoll.gif http://www.murderousmaths.co.uk/games/goll1rv.gif

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[1] Allen, J., Inference from Signs: Ancient Debates about the Nature of Evidence, page 207. Oxford University Press. (2001).

[2] Barnes, J., Pyrrhonism, Belief and Causation. Observations on the Skepticism of Sextus Empiricus, p. 2661-2662, in Aufstieg und Niedergang der römischen Welt:: Geschichte und Kultur Roms im Spiegel der neueren Forschung. ed. Werk, Vogt, Haase, Temporini. Walter de Gruyter. (1997).