betti(Matrix) -- display of the degrees of a map

Synopsis

• Usage:

  betti f

• Function: betti
• Inputs:

  • f, a matrix
• Outputs:

  • a Betty tally, a diagram showing the degrees of the generators of the source and target modules of f

Description

i1 : S = ZZ/10007[x,y];

i2 : betti matrix{{x^3,x*y^2},{y*x,y^2}}

            0 1
o2 = total: 2 2
         0: 2 .
         1: . .
         2: . 2

o2 : BettiTally

Caveat