# Partial order; Hasse diagram

For the set A = {a, b, c}, let R be the relation on A which is defined by the following 3 by 3 matrix M_R:

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Row 1: 1 0 1

Row 2: 1 1 0

Row 3: 0 1 1

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Determine whether R is a partial order. If it is, draw its Hasse diagram.

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#### Solution Preview

We use the positions of the 1's in the matrix M_R to determine R (i.e., to determine the set of ordered pairs of elements of the set {a, b, c} which belong to R):

From the first row of M_R (which indicates the elements (a, x) in R, for x in A), we see that (a, a) and (a, c) are in R (but not (a, b)), because the first and third elements of the first row are the locations of the 1's.

From the second row of M_R (which indicates the elements (b, x) in R, for x in A), we see that (b, a) and (b, b) are in R (but not (b, c)), because the first and second ...

#### Solution Summary

A detailed determination of whether the given binary relation is a partial order is presented. If it is a partial order, its Hasse diagram is also drawn.