Bolzano‘s Theorem

定义网址:https://www.geogebra.org/m/Rb9VJVH8

The theorem that a single-valued, real-valued, continuous function of a real variable

is equal to zero at some point in an interval if its values at the end points of the interval have opposite sign.

https://encyclopedia2.thefreedictionary.com/Bolzano%27s+Theorem

 

 

 

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