Changes

| url = http://turnbull.mcs.st-and.ac.uk/~history/Biographies/Lambert.html

| url = http://turnbull.mcs.st-and.ac.uk/~history/Biographies/Lambert.html

| title = Biography of Johann Heinrich Lambert

| title = Biography of Johann Heinrich Lambert

| accessdate = 2012-02-12}}</ref> proved this in 1761 by showing that pi is an [[irrational number]], which means that it can't be expressed as a fraction. In 1882, Lindeman proved that pi is also a [[transcendental number]], which means that it can't be expressed as the solution to any simple equation).<ref>{{cite web

| accessdate = 2012-02-12}}</ref> In 1882, Lindeman proved that pi is also a [[transcendental number]], which means that it can't be expressed as the solution to any simple equation).<ref>{{cite web

| url = http://turnbull.mcs.st-and.ac.uk/~history/Biographies/Lindemann.html

| url = http://turnbull.mcs.st-and.ac.uk/~history/Biographies/Lindemann.html

| title = Biography of Carl Louis Ferdinand von Lindemann

| title = Biography of Carl Louis Ferdinand von Lindemann

| accessdate = 2012-02-12}}</ref>

| accessdate = 2012-02-12}}</ref> which means that it can't be expressed as a fraction.

==History==

==History==