Function: msnew
Section: modular_symbols
C-Name: msnew
Prototype: G
Help: msnew(M): M being a full modular symbol space, as given by msinit,
return its new cuspidal subspace.
Doc:
$M$ being a full modular symbol space, as given by \kbd{msinit},
return the \emph{new} part of its cuspidal subspace. A subspace is given by
a structure allowing quick projection and restriction of linear operators;
its first component is a matrix with integer coefficients whose columns form
a $\Q$-basis of the subspace.
\bprog
? M = msinit(11,8, 1); \\ M_8(Gamma_0(11))^+
? N = msnew(M);
? #N[1] \\ 6-dimensional
%3 = 6
@eprog