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filter -- returns a principal filter 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 : F = filter (P,d)

o4 = {a, c, d}

o4 : List

See also

Ways to use filter :