When was eratosthenes born and died

          When was eratosthenes born...

          When did eratosthenes measure the earth

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          6. Theon of Smyrna

          2nd century Greek mathematician and philosopher

          Theon of Smyrna (Greek: Θέων ὁ ΣμυρναῖοςTheon ho Smyrnaios, gen. Θέωνος Theonos; fl. 100 CE) was a Greekphilosopher and mathematician, whose works were strongly influenced by the Pythagorean school of thought.

          His surviving On Mathematics Useful for the Understanding of Plato is an introductory survey of Greek mathematics.

          Life

          Little is known about the life of Theon of Smyrna. A bust created at his death, and dedicated by his son, was discovered at Smyrna, and art historians date it to around 135 CE.

          Ptolemy refers several times in his Almagest to a Theon who made observations at Alexandria, but it is uncertain whether he is referring to Theon of Smyrna.[1] The lunarimpact craterTheon Senior is named for him.

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          Works

          Theon wrote several commentaries on the works of mathematicians and philosophers of the time, including works on the philosophy of Plato. Most of these works are lost. The