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Bolzano's Theorem
Bolzano's theorem states that if is a continuous function in the closed interval with and of opposite sign, then there is a in the open interval such that .



Snapshot 1: The function is positive in the interval and therefore for all in .
Snapshot 2: The function is negative in the interval so for all in .
Snapshot 3: The function is positive for and negative for , therefore there is a in such that .


"Bolzano's Theorem" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/BolzanosTheorem/
Contributed by: Julio Cesar de la Yncera
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