This is a theorem that for a continuous function f , any intermediate value between f ( a ) and f ( b ) can be taken on in [ a , b ]. The continuity of real numbers is based on the fact that the interval is a connected set. This means that for a continuous function, the graph is connected. However, a continuous function is a different concept from connectivity, and it cannot generally be said that a function whose graph is connected is a continuous function. When f is differentiable, the derivative f ' is not necessarily continuous, but the intermediate value theorem holds. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
連続関数 f について,f(a) と f(b) の間の任意の中間の値を [a,b] でとる,という定理。実数の連続性として,区間が連結集合であることを根拠にしている。これは,連続関数ではグラフがつながっていることを意味している。しかし,連続関数というのは連結性とは別の概念で,グラフがつながっている関数が連続関数であるとは,一般にはいえない。 f が微分可能のとき,導関数 f' は連続とはかぎらないが,中間値の定理は成立する。
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