The meet of $a$ and $b$ in $P$, if it exists, is the unique greatest element less than both $a$ and $b$.
i1 : P = poset {{a,b}, {a,c}, {b,d}, {c,d}, {e,d}}; |
i2 : meetExists(P, b, c) o2 = true |
i3 : meetExists(P, b, e) o3 = false |
i4 : Q = poset {{a,b}, {a,c}, {d,b}, {d,c}, {b,e}, {c,e}}; |
i5 : meetExists(Q, b, c) o5 = false |
The object meetExists is a method function.