KnowraBolzano's theoremLinked fromLinked fromThe 2 pages that link to Bolzano's theorem, each with the reason it gives.All 2Broader topic 2Intermediate value theoremBroader topic: This historically prominent special case captures the theorem's root-existence form.Bernard BolzanoBroader topic: Bolzano gave an early rigorous proof of this result using continuity and the intermediate value property.