isStableIdeal -- whether a monomial ideal in an exterior algebra is stable

• Usage:

  isStableIdeal I

• Inputs:
  • I, a monomial ideal of an exterior algebra
• Outputs:
  • a Boolean value, true whether ideal I is stable

i1 : E=QQ[e_1..e_4,SkewCommutative=>true]

o1 = E

o1 : PolynomialRing, 4 skew commutative variable(s)

i2 : isStableIdeal ideal {e_2*e_3}

o2 = false

i3 : isStableIdeal ideal {e_1*e_2,e_2*e_3}

o3 = true