FREE ESSAY ON CHRONOLOGICAL ORDER

CHRONOLOGICAL 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 analytic geometry 
1641 Descartes' Geometrie was published 
1654 Pascal and Fermat discuss theory of probability in their correspondence 
1655 Wallis introduces the symbol for infinity 
1660 Fermat leaves last theorem 
1665 Newton invents calculus 
1669 Barrow discovered the general solution for the tangent line to a curve 
1675 Leibniz invents calculus 
1696 L'Hopital wrote the first text on differential calculus 
1715 Brook Taylor's published account of polynomial approximations of transcental
functions 
1742 Goldbach states famous conjecture 
1748 Agnesi writes Foundations of Analysis 
1755 Euler shows that ePi i + 1 = 0 that epi i + 1 = 0 
1770 Lambert proves pi is irrational 
1773 Saccheri writes Euclid Freed of Every Flaw 
1797 Lagrange proved the Mean Value Theorem 
1814 Argand graphs imaginary numbers 
1828 Gauss determines the convergence of infinite series 
1830 Galois writes agout group theory 
1842 Lovelace describes how to program Babbages Analytical Engine 
1854 Riemann creates elliptic geometry 
1854 Cayley uses matrices in solving equations 
1858 Mobius strip is discovered 
1888 Kovalevski is the first woman to earn a doctorate in mathematics 
1895 Cantor creates transfinite numbers 
1905 Einstein publicly formulated his theory on relativity 
1910 Whithead and Russell write Principia Mathematica 
1919 Alice Hamilton is Harvard's first female professor 
1931 Godel publishes incompleteness theorems 
1942 ENIAC, the first electronic computer is invented 
1974 Mrs. Greminger became a mathematics instructor at Valle High School 
1975 Bill Gates started his computer company Microsoft 
1976 Four color map problem is solved 
1998 Mrs. Moll became a mathematics instructor at Valle High School