http://chrontables.netsons.org/en/in-costruzione/scientists/mathematicians-and-geometers/

-624 – -546 Talete di Mileto has various theorems attributed to him.

-580 – -495 Pythagoras (Samo -Metaponto) studies propositional geometry and vibrating lyre strings; his group discovers the irrationality of the square root of 2.

-460 – -370 Democrito, Leucippo.

-408 – -355 Eudoxus of Cnidus

-300 Euclide in his Elements studies geometry as an axiomatic system; infinitude of prime numbers; Euclidean algorithm; law of reflection in Catoptrics; fundamental theorem of arithmetic.

-262 -198 Apollonius of Perga

-260 Archimedes proved that the value of π lies between 3 + 1/7 (approx. 3.1429)
and 3 + 10/71 (approx. 3.1408), that the area of a circle was equal to π
multiplied by the square of the radius of the circle; the area enclosed by a
parabola and a straight line is 4/3 multiplied by the area of a triangle with
equal base and height; a very accurate estimate of the value of the square root
of 3.