Question: For A = {a, b, c, d, e, v, w, x, y, z}, consider the poset (A, R) whose Hasse diagram is shown in Fig.

For A = {a, b, c, d, e, v, w, x, y, z}, consider the poset (A, R) whose Hasse diagram is shown in Fig. 7.25. Find
(a) glb{b, c}
(b) glb{b, w]
(c) glb{e, x}
(d) lub{c, b}
(e) lub{d, x}
(f) lub{c, e}
(g) lub{a, v}
Is (A, R) a lattice? Is there a maximal element? a minimal element? a greatest element? A least element?

Figure 7.25

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