Integer and floating-point vectors, matrices and linear-system solvers.

1. Vectors of natural, integer, floating-point, and complex numbers

     vectors            Vectors
     nat_vec            Natural_Vectors
     nat_vec_io         Natural_Vectors_io
     int_vec            Integer_Vectors
     int_vec_io         Integer_Vectors_io
     flt_vec            Float_Vectors
     flt_vec_io         Float_Vectors_io
     cmp_vec            Complex_Vectors
     cmp_vec_io         Complex_Vectors_io

2. Vectors of vectors

     nat_vvc            Natural_Vectors_of_Vectors
     nat_vvc_io         Natural_Vectors_of_Vectors_io
     int_vvc            Integer_Vectors_of_Vectors 
     int_vvc_io         Integer_Vectors_of_Vectors_io
     flt_vvc            Float_Vectors_of_Vectors
     flt_vvc_io         Float_Vectors_of_Vectors_io
     cmp_vvc            Complex_Vectors_of_Vectors
     cmp_vvc_io         Complex_Vectors_of_Vectors_io

3. Matrices of natural, integer, floating-point, and complex numbers

     nat_mat            Natural_Matrices
     nat_mat_io         Natural_Matrices_io
     int_mat            Integer_Matrices
     int_mat_io         Integer_Matrices_io
     flt_mat            Float_Matrices
     flt_mat_io         Float_Matrices_io
     cmp_mat            Complex_Matrices
     cmp_mat_io         Complex_Matrices_io

4. The linear-system solvers

     gcd                Greatest_Common_Divisor
     int_lss            Integer_Linear_System_Solvers
     int_lis            Integer_Linear_Inequality_Solvers
     flt_lss            Float_Linear_System_Solvers
     cmp_lss            Complex_Linear_System_Solvers
