findHeft -- find a heft vector for a list of degrees

• Usage:

  findHeft(degs, DegreeRank => r)

• Inputs:
  • degs, a list, of multi-degrees, each of which is a list of integers of fixed length r
• Optional inputs:
  • DegreeRank => an integer, default value null
  • DegreeGroup => ..., default value null
• Outputs:
  • a list, of integers of length r, or
  • null, if there is none

i1 : findHeft({{-1,0}, {2,1}}, DegreeRank => 2)

o1 = {-1, 3}

o1 : List

i2 : findHeft({}, DegreeRank => 0)

o2 = {}

o2 : List