Eighteenth-century mathematician William Jones had a problem with pi—namely, it didn’t exist yet. At the time of his working and teaching in the field of mathematics, there was no term for the ratio of a circle’s circumference to its diameter, despite the value’s importance to even the most basic study of geometry. In his 1706 book, Synopsis Palmariorum Matheseos, or A New Introduction to the Mathematics, he made a modest proposal: that the universal constant be known as pi, and thus was mathematical histor... READ ON