ra119272 ra119272

11-02-2024
Mathematics

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2. Is the set {(x, y, z) ∈ R^3 ; z = 0 and x^2 + y^2 ≤ 1} a regular surface? Is the set {(x, y, z) ∈ R^3 ; z = 0, and x^2 + y^2 < 1} a regular surface?

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