Milestones in Mathematics By CelesteEssence Jan 1, 1525 Rudolff introduces the radical sign Jan 1, 1535 Tartaglia solves cubic equations Jan 1, 1557 Recorde introduces the equals sign Jan 1, 1565 Goldbach states famous conjecture. Jan 1, 1585 Stevin introduces decimals Jan 1, 1621 Harriot introduces the inequality signs Jan 1, 1630 Oughtred invents the slide rule Jan 1, 1637 Descartes creates analytic geometry Jan 1, 1654 Pascal and Fermat discuss theory of probability in their correspondence. Jan 1, 1655 Wallace introduces the symbol for infinity Jan 1, 1660 Fermat leaves last theorem Jan 1, 1660 Napier invents logarithms Jan 1, 1675 Leibniz invents calculus Jan 1, 1687 Newton invents calculus Jan 1, 1748 Agnesi writes "Foundations of Analysis" Jan 1, 1755 Euler shows that e^πi+1=0 Jan 1, 1768 Lambert proves π is irrational Jan 1, 1773 Saccheri writes "Euclid Freed of Every Flaw" Jan 1, 1814 Argand graphs imaginary numbers. Jan 1, 1828 Gauss determines the convergence of infinite series. Jan 1, 1830 Galois writes about group theory Jan 1, 1842 Lovelace describes how to program Babbage's "Analytical Engine" Jan 1, 1854 Riemann creates elliptic geometry Jan 1, 1858 Moblus strip is discovered Strip of poper Jan 1, 1888 Kovalevski is the first woman to earn a doctorate in mathematics. Jan 1, 1895 Cantor creates transfinite numbers Jan 1, 1910 Whitehead and Russel write Principia Mathematica Jan 1, 1931 Godel publishes "incompleteness" theorems. Jan 1, 1942 ENIAC, the first electronic computer, is invented. Jan 1, 1976 Four-Color map problem is solved Mar 2, 2022 Al-Khowarizmi uses zero
