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    Limit of function of two variables

    Homework Statement Find all real a and b such that the limit \lim_{(x,y) \to (0,0)} \frac{\left\vert x \right\vert ^a \left\vert y \right\vert ^b}{x^2+y^2} exists and is finite. (Hint: it is not enough to find the limit or prove it exists in the region found. You must also prove that the limit...
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