Question: Let (, a function of n variable, be continuous on an open set D, and suppose that P0 is in D, with ( (P0) >

Let (, a function of n variable, be continuous on an open set D, and suppose that P0 is in D, with ( (P0) > 0. Prove that there is a ( > 0 such that ( (P) > 0 in a neighborhood of P0 with radius (.

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