#   make a list of prefix use for functions
 -      nf -> number field
 -      bnf/rnf
 -      is -> boolean functions
 -      zn -> Z/nZ
 -      ff -> finite fields
 -      qf -> quadratic forms
 -      mat -> matrices
 -      ell -> elliptic curves
 -      dir -> dirichlet series
 -      ms -> modular symbols
 -      pol -> polynomials
 -      ser -> series
 -      int -> integration
 -      sum -> sums
 -      vec -> operations on vectors

# what is a good prefix ?
 -      meaningful
 -      short
 -      discriminant (should not prefix any existing function)
 -      3-4 letters seems appropriate for most packages

#  suggest appropriate prefix for new families
 -      nca -> non commutativ algebras / aal -> associative algebras [ ? ]
 -      lfun -> lfunctions [ ? ]