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4) For each of the following functions, establish on which subset of its domain it is...

4) For each of the following functions, establish on which subset of its domain it is C1. (You do not need to provide formal proofs in your answers: an explanation or brief graphical argument is sufficient.) Compute partial derivatives for these subsets.

(a) f(x) = ⌈x⌉ (recall ⌈x⌉ is the lowest integer above or equal to x).

(b) f(x, y) = min{x, y}.

(c) f(x, y) = xαyβ where α, β ∈ (0,1).

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