Changes

| url = http://www-groups.dcs.st-and.ac.uk/history/HistTopics/Pi_through_the_ages.html  

| url = http://www-groups.dcs.st-and.ac.uk/history/HistTopics/Pi_through_the_ages.html  

| title = A history or Pi

| title = A history or Pi

| accessdate = 2012-02-11}}</ref> who selected  '''<big><math>\pi</math></big>''' because it is the first letter of the Greek word for [[perimeter]] (''περίμετρος''), i.e. the circumference of a circle is its perimeter.  A Swiss mathematician, [[Leonhard Euler]], brought the concept into general use in 1737.  The [[infinite]] length of ostensibly [[random]] decimal points in <math>\pi</math> lead to the assumption that pi is a [[normal number]]: it contains every possible finite sequence of digits, and therefore, every birthday, even the equivalent of every book ever written.

| accessdate = 2012-02-11}}</ref> who selected  '''<big><math>\pi</math></big>''' because it is the first letter of the Greek word for [[perimeter]] (''περίμετρος''), i.e. the circumference of a circle is its perimeter.  A Swiss mathematician, [[Leonhard Euler]], popularized the notation in 1737, after it had been previously used by an obscure math teacher named William Jones in 1706.<ref>https://www.historytoday.com/archive/feature/man-who-invented-pi</ref> The [[infinite]] length of ostensibly [[random]] decimal points in <math>\pi</math> lead to the assumption that pi is a [[normal number]]: it contains every possible finite sequence of digits, and therefore, every birthday, even the equivalent of every book ever written.

<big><math>\pi</math></big> is referenced in the [[Bible]], literature, and even as the title of a movie.  It is central to the most famous identity in all of mathematics:  [[Euler's Formula|Euler's Identity]].

<big><math>\pi</math></big> is referenced in the [[Bible]], literature, and even as the title of a movie.  It is central to the most famous identity in all of mathematics:  [[Euler's Formula|Euler's Identity]].