def _action(self,A):
#if A not in self._group:
# raise ValueError,"Action is only defined for {0}!".format(self._group)
a,b,c,d=A
[z,n,l]=factor_matrix_in_sl2z(int(a),int(b),int(c),int(d))
#l,ep = factor_matrix_in_sl2z_in_S_and_T(A_in)
res = copy(self.T.parent().one())
if z==-1 and self.v<>None:
tmp = self.v(SL2Z([-1,0,0,-1]))
for j in range(self._dim):
res[j,j]=tmp
if n<>0:
res = self.T**n
for i in range(len(l)):
res = res*self.S*self.T**l[i]
return res
def _action(self,A):
#if A not in self._group:
# raise ValueError,"Action is only defined for {0}!".format(self._group)
a,b,c,d=A
if self._group==SL2Z:
[z,n,l]=factor_matrix_in_sl2z(int(a),int(b),int(c),int(d))
# l,ep = factor_matrix_in_sl2z_in_S_and_T(A_in)
res = self.T.parent().one()
if z==-1 and self.Z<>None:
res = self.Z #v(SL2Z[-1,0,0,-1])
# for j in range(self.dim):
# res[j,j]=tmp
if n<>0:
res = self.T**n
for i in range(len(l)):
res = res*self.S*self.T**l[i]
elif A in self.vals.keys():
res = self.vals[A]
else:
raise NotImplementedError,"Can not write as word in generators of {0}".format(self._group)
return res
