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Macaulay2 web site
Posets
::
Poset _ List
Poset _ List -- returns elements of the ground set
Synopsis
Usage:
V = P_L
Operator:
_
Inputs:
P
,
an object of class
Poset
L
,
a
list
, indices in the ground set
Outputs:
V
,
a
list
, the vertices indexed by
L
in the ground set
Description
This method allows easy access to the vertices of the poset.
i1 : P = booleanLattice 3;
i2 : P_{2,4,5} o2 = {010, 100, 101} o2 : List
See also
Poset _ ZZ
-- returns an element of the ground set
Poset _*
-- returns the ground set of a poset
Poset
-- a class for partially ordered sets (posets)