Dionysodorus
# Dionysodorus

### Born: about 250 BC
in Greece

Died: about 190 BC

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**Dionysodorus** solved the problem of the cubic equation using the intersection of a parabola and a hyperbola.
There is certainly more than one mathematician called Dionysodorus and this does make it a little difficult in deciding exactly what was studied by each.

Dionysodorus is believed to have invented a conical sundial. The report fails to make it clear which Dionysodorus this is, but the fact that the Dionysodorus described here worked on conic sections makes it likely that he is also the person to have studied a conical sundial.

**References (2 books/articles)**

JOC/EFR December 1996