heft -- heft vector of ring, module, graded module, or resolution

Synopsis

• Usage:

  heft X

• Inputs:
  • X, a ring, a module, a graded module, or a resolution
• Outputs:
  • a list, the heft vector in use for X, if X is a ring, or for the ring of X, if X is a module. If there is no heft vector, then null is returned.

Description

i1 : S = QQ[a..d,DegreeRank => 4];

i2 : degrees S

o2 = {{1, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1}}

o2 : List

i3 : heft S

o3 = {1, 1, 1, 1}

o3 : List

See also

• heft vectors