changeBaseField -- extend scalars for modules, matrices, and coherent sheaves

• Usage:

  changeBaseField(L, M)

• Inputs:
  • L, a ring, a Galois field, or an integer, the new coefficient ring or field data
  • M, a module, a matrix, or a coherent sheaf,
• Outputs:
  • a module,
  • a matrix,
  • a coherent sheaf,