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| | <blockquote style="display:table;background:#eeeeee;padding:10px;" class="toccolours"> | | <blockquote style="display:table;background:#eeeeee;padding:10px;" class="toccolours"> |
| − | ===[[Pi]]===
| + | Inactive. |
| − | '''Pi''' is an [[irrational number]] (in fact, [[transcendental number]], as proved by Lindeman in 1882) denoted by the greek letter <math>\pi </math>.
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| − | Pi is the [[ratio]] of the [[circumference]] ([[perimeter]]) of a given [[circle]] to its [[diameter]]. It is approximately equal to 3.141592653. The number pi is one of the most important [[constant]]s in all of mathematics and appears in some of the most surprising places, such as in the sum <math>\sum_{n=1}^\infty \frac{1}{n^2}=\frac{\pi^2}{6}</math>. Some common... [[Pi|[more]]]
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| | </blockquote> | | </blockquote> |
