Bolzano’s theorem

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Bernard Bolzano (1781-1848) presents Bolzano’s theorem: a continuous function which is negative at one point and positive at another point must be zero for at least one point in between.

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Citation:
Editors. "Bolzano’s theorem". The Literary Encyclopedia. First published 01 May 2009
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6245, accessed 19 April 2014.]