Bolzano.png (7KB, MIME type: image/png)
image/png
Author: Smári McCarthy.
Depicts Bolzano's law; f is a continuous function, [a,b] is a closed interval. Bolzano's law states that since f(a) and f(b) have opposite signs (one is minus, the other plus), then there exists a value c for which f(c) = 0.
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