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He also invented the [[sieve of Eratosthenes]], which is a technique for separating composite from prime numbers in a natural series. The sieve appears in the ''Introduction to arithmetic'' by [[Nicomedes]].
He also invented the [[sieve of Eratosthenes]], which is a technique for separating composite from prime numbers in a natural series. The sieve appears in the ''Introduction to arithmetic'' by [[Nicomedes]].
Eratosthenes was the third librarian at Alexandria; in addition to his knowledge in many different areas, he was an accomplished mapmaker. Eratosthenes also made a catalog of stars with 675 stars listed in it.
Eratosthenes was the third librarian at Alexandria; in addition to his knowledge in many different areas, he was an accomplished mapmaker. Eratosthenes also made a catalogue of stars with 675 stars listed in it.
His followers called him the second [[Plato]].
His followers called him the second [[Plato]].