Problem 4. Let LC R³ be the lower hemispherc, i.c. FOLLO ALLE = {(x, y, z) | x² + y² + z² = 1 and z≤ 0}. Let DCR³ be the closed disk in the xy-plane, i.e., D = {(x, y,0) | x² + y² ≤ 1}. a for a homegmarah for f-15 9.0 NM J a. Give an explicit expression for wolle homeomorphism f: L→ D. b. Give an explicit expression for f-¹.

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