Question: (a) For A = {a1, a2, . . . , an}, let (A, R) be a poset. If M(R) is the corresponding relation matrix, how

(a) For A = {a1, a2, . . . , an}, let (A, R) be a poset. If M(R) is the corresponding relation matrix, how can we recognize a maximal or minimal element of the poset from M(R)?
(b) How can one recognize the existence of a greatest or least element in (A, R) from the relation matrix M (R)?

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