Let A = {1, 2, 4, 6, 8} and, for a, b ∈ A, define a, b if and only if is an integer.
(a) Prove that < defines a partial order on A.
(b) Draw the Hasse diagram for ≤.
(c) List all minimum, minimal, maximum, and maximal elements.
(d) Is (A, ≤) totally ordered? Explain.
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