| 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
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| 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