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 [ ? ]