Function: mfbracket
Section: modular_forms
C-Name: mfbracket
Prototype: GGD0,L,
Help: mfbracket(F,G,{m=0}): compute the
 m-th Rankin-Cohen bracket of the generalized modular forms F and G.
Doc: compute the $m$-th Rankin--Cohen bracket of the generalized modular
 forms $F$ and $G$.
 \bprog
 ? E4 = mfEk(4); E6 = mfEk(6);
 ? D1 = mfbracket(E4,E4,2); mfcoefs(D1,5)/4800
 %2 = [0, 1, -24, 252, -1472, 4830]
 ? D2 = mfbracket(E4,E6,1); mfcoefs(D2,10)/(-3456)
 %3 = [0, 1, -24, 252, -1472, 4830]
 @eprog

