raysPPn -- The rays of the standard fan of projective space or weighted projective space.

• Usage:

  raysPPn(n)

• Inputs:
  • n, an integer, positive
  • L, a list, with at least 2 elements and first entry 1
• Outputs:
  • a matrix,

i1 : raysPPn(2)

o1 = | -1 -1 |
     | 1  0  |
     | 0  1  |

              3       2
o1 : Matrix ZZ  <-- ZZ