Seventeen Equations That Changed the World - Ian Stewart  ## Metadata - Author: **Ian Stewart** - Full Title: Seventeen Equations That Changed the World - Category: #books ## Highlights - There are two kinds of equations in mathematics, which on the surface look very similar. One kind presents relations between various mathematical quantities: the task is to prove the equation is true. The other kind provides information about an unknown quantity, and the mathematician’s task is to solve it – to make the unknown known. (Location 37) - Around 250 BC Euclid became the first modern mathematician when he wrote his famous Elements, the most influential mathematical textbook ever. Euclid turned geometry into logic by making his basic assumptions explicit and invoking them to give systematic proofs for all of his theorems. (Location 93)