In 1655 the English mathematician John Wallis published a book in which he derived a formula for pi as the product of an infinite series of ratios. Now researchers, in a surprise discovery, have found ...

Thursday marks Pi Day, otherwise known as 3.14, which marks the ratio of a circle's circumference to its diameter. While the average citizen can easily remember the 3.14 ratio, the exact ratio ...

Mathematician Carlos Castillo-Chavez says that pi is so important to math that using its simple, geometric definition denies its greater powers. “[Pi] brings you into the world of mathematics, which ...