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orderIdeal -- returns a principal order ideal generated by the given element

Synopsis

Description

i1 : G = {a,b,c,d};
i2 : R = {(a,b), (a,c), (c,d)};
i3 : P = poset (G,R);
i4 : O = filter (P,c)

o4 = {a, c}

o4 : List

See also

Ways to use orderIdeal :