The multiplication sign ✕ as now used universally was first introduced by the English mathematician and clergyman William Oughtred in 1631. pic.twitter.com/z0OIT76N5J
In 1919, Viggo Brun proved that the sum of the reciprocals of twin primes converges to Brun's constant. In 1994, Thomas Nicely discovered a flaw in the Intel Pentium Microprocessor while calculating Brun's constant. It cost Intel millions of dollars to replace the faulty chips! pic.twitter.com/tI9APBVtdn
Three integers satisfying a² + b² = c² form a Pythagorean triple, which can be drawn as a right triangle, or a point (a/c, b/c) on the unit circle. Amazing fact: starting with the four Pythagorean triples (±1,0,1), (0,±1,1) all others can be generated via hyperbolic reflections. pic.twitter.com/XORBHcbM1Z
