Function: mfperiodpolbasis
Section: modular_forms
C-Name: mfperiodpolbasis
Prototype: LD0,L,
Help: mfperiodpolbasis(k,{flag=0}): basis of period polynomials for weight k.
 If flag=1 or -1, basis of odd or even period polynomials.
Doc: Basis of period polynomials for weight $k$. If $\fl=1$ or $-1$, basis of
 odd or even period polynomials.
 \bprog
 ? mfperiodpolbasis(12,1)
 %1 = [x^8 - 3*x^6 + 3*x^4 - x^2, x^10 - 1]
 ? mfperiodpolbasis(12,-1)
 %2 = [4*x^9 - 25*x^7 + 42*x^5 - 25*x^3 + 4*x]
 @eprog
