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  3. 3 let rr1 r2 z is an element of...

Question: 3 let rr1 r2 z is an element of...

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3. Let R(r1, r2) = {z is an element of C (complex numbers) | r1 < |z| < r2}. By the definition, is this set an open set? COMPLEX ANALYSIS

3. Let R(ri, r2) = {-E C | ri < 너 〈 r2). By t e deinition, is this set an open se t?

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