From the quiz on 8/3/16.

Which mathematical concept was invented by Scottish mathematician John Napier and published in 1614 as a way of simplifying difficult calculations (required in fields such as astronomy) by converting multiplication to addition? Logarithm

Which mathematical symbol was invented by Welsh mathematician Robert Recorde in his 1557 work The Whetstone of Witte, albeit in a somewhat unfamiliar elongated form? Equals sign

In 1736, Leonhard Euler laid the foundations of graph theory when he resolved (in the negative) a famous problem known as the Seven Bridges of which Prussian city? Königsberg

At the International Congress of Mathematicians in Paris in 1900, which German mathematician outlined a list of 23 unsolved problems, including the continuum hypothesis and Riemann hypothesis, which significantly influenced the direction of mathematical research in the 20th century? David Hilbert

Which Greek mathematician of the 3rd century BC wrote the major work The Method of Mechanical Theorems, which contains the earliest known explicit use of infinitesimals to solve geometrical area and volume problems, predating Newton and Leibniz’s calculus by some 2000 years? Archimedes