# Maximum-Minimum Theorem : Cont

(d) Does the conclusion of the Maximum-Minimum Theorem always hold for a bounded function f : R –> R that is continuous on R? Prove or give a counterexample.
(a) Fix a, b E R, a < b. Prove that if f [a, b] –>R is continuous on [a, b] and f(x)&#8800;0 for all x E [a, b], then 1/f(x) is bounded on [a, b].
(b) Find a, b E R, a < b, and a function f: (a, b) –> R that is continuous on (a, b), such that f(x)&#8800;0 for all x E (a, b), but 1/f(x)is not bounded on (a, b).

Recall:
Max-Min theorem:
Let f: [a, b] -> R (real numbers) be continuous on [a, b]. Then f has an absolute maximum and an absolute minimum on [a, b]

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