Explain why or why not Determine whether the

Chapter 12, Problem 59

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Explain why or why not Determine whether the following statements are true and give an explanation or counterexample. a. If the limits lim 1x,02S10,02 f 1x, 02 and lim 10,y2S10,02 f 10, y2 exist and equal L, then lim 1x,y2S10,02 f 1x, y2 = L. b. If lim 1x,y2S1a,b2 f 1x, y2 equals a finite number L, then f is continuous at 1a, b2. c. If f is continuous at 1a, b2, then lim 1x,y2S1a,b2 f 1x, y2 exists. d. If P is a boundary point of the domain of f, then P is in the domain of f.

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