who is credited with first using the symbol for pi in what year
Pi The earliest known use of the Greek letter π alone to represent the ratio of a circle's circumference to its diameter was by Welsh mathematician William Jones in his 1706 work Synopsis Palmariorum Matheseos; or, a New Introduction to the Mathematics.[100][101] The Greek letter first appears there in the phrase "1/2 Periphery (π)" in the discussion of a circle with radius one.[102] However, he writes that his equations for π are from the "ready pen of the truly ingenious Mr. John Machin", leading to speculation that Machin may have employed the Greek letter before Jones.[96] Jones' notation was not immediately adopted by other mathematicians, with the fraction notation still being used as late as 1767.[93][103]