et A = {2,3,4, 7, 19, 21} and define < on A by x < y if and only if (y – 1)|(x – 1). a. Show that (A, 3) is a poset. b. Draw the Hasse Diagram of the poset. c. Find any maximal and minimal element/s. d. Find any greatest and least element/s. e. Find all lower bounds and all upper bounds of {4, 7}. f. Find the glb({4,7}), if it exists. -

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