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math, physics, and chemistry
>
Wells Tela this Extremum axiom
维尔斯特拉斯极值定理
叙述如下:如果函数在一个区间i,a≤x≤b上连续(包括区间的端点a和b),那么在区间 i内必然至少存在一点,在这点f(x)取得最大值m,而且有另一个点,使f(x)取得最小值m。