Function: msstar
Section: modular_symbols
C-Name: msstar
Prototype: GDG
Help: msstar(M,{H}): M being a full modular symbol space,
as given by msinit, return the matrix of the * involution, induced by
complex conjugation, acting on the (stable) subspace H (M if omitted).
Doc: $M$ being a full modular symbol space, as given by \kbd{msinit},
return the matrix of the \kbd{*} involution, induced by complex conjugation,
acting on the (stable) subspace $H$ ($M$ if omitted).
\bprog
? M = msinit(11,2); \\ M_2(Gamma_0(11))
? w = msstar(M);
? w^2 == 1
%3 = 1
@eprog