generator -- provide a single generator

• Usage:

  generator I

• Inputs:
  • I, an ideal or a module
• Outputs:
  • the single generator of I, if it has just one

i1 : I = ideal (4,6)

o1 = ideal (4, 6)

o1 : Ideal of ZZ

i2 : generator I

o2 = 2

i3 : M = image matrix {{4,6},{0,0}}

o3 = image | 4 6 |
           | 0 0 |

                               2
o3 : ZZ-module, submodule of ZZ

i4 : generator M

o4 = | 2 |
     | 0 |

o4 : Vector