filter -- computes the elements above given elements in a poset

• Usage:

  F = filter(P, L)

• Inputs:
  • P, an instance of the type Poset,
  • L, a list, elements of the poset
• Outputs:
  • F, a list, containing all elements greater than or equal to at least one of the given elements

i1 : P = booleanLattice 3;

i2 : filter(P, {"001", "100"})

o2 = {001, 011, 101, 111, 100, 110}

o2 : List