coverMap(Module) -- the surjective map from a free module to a module corresponding to the generators

Synopsis

Usage:
coverMap M
Function: coverMap
Inputs:
- M, a module
Outputs:
- a matrix, the surjective map from a free module to M corresponding to the generators

i1 : M = image matrix {{2},{0}}

o1 = image | 2 |
           | 0 |

                               2
o1 : ZZ-module, submodule of ZZ

i2 : f = coverMap M

o2 = | 1 |

o2 : Matrix

i3 : isSurjective f

o3 = true