chronoligical order

-399 pythagoreans discover irrational numbers -240 Eratosthenes determines circumference of earth -230 Archimedes determines fromulas for the area of a secton of a parabola formulas for the area of a section of a parabola -200 Appollonius studies conic sections -200 Euclid writes Elements -100 Hipparchus develops the trig tables 825 Al-Khowarizmi uses Zero 1525 Rudolff introduces the radical sign 1535 Tartaglia solves cubic equations 1545 Square roots of negative numbers 1557 Recorde introduces the equals sign 1565 Goldbach states famous conjecture 1614 Napier invents logarithms 1614 Briggs uses base 10 logarithms 1621 Harriot introduces the inequality signs 1630 Oughtred invents the slide rule 1637 Descartes creates...