# Mathematician:Geminus of Rhodes

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## Mathematician

Greek astronomer and mathematician about whom practically nothing is known.

Named the cissoid of Diocles after Diocles of Carystus.

Gave a proof (incorrect) of Euclid's fifth postulate, the first on record.

A student (or later follower) of Posidonius.

## Nationality

Greek

## History

- Born: about 10 BCE in (possibly) Rhodes, Greece
- Died: about 60 CE

Possibly lived as much as 80 years before these dates.

## Publications

*Εἰσαγωγὴ εἰς τὰ Φαινόμενα*("Introduction to the Phenomena") (often referred to as the "Isagoge")

### Lost (of which only fragments survive)

- A commentary on Posidonius' work
*On Meteorology* *Doctrine, (or Theory) of Mathematics*

## Also known as

In Greek: **Γεμῖνος ὁ Ῥόδιος**