Given a continuous function f:[a, b] -> R that is differentiable on (a, b), the Mean-ValueTheorem (MVT) of elementary calculus allows us to 'predict" a value of f'(x).Knowing only the boundary values f(a) and f(b), we predict that f'((a,b))э(f(b)-f(a))/(b-a). May we not expect an analogous result for f:K -> R when K is a.

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