 | 1 | initial version |
I am new to sage and trying to figure out how to calculate the series expansion of the theta function for an even lattice $L$, i.e. $$\Theta_L(q)=\sum_{x\in L} q^{\langle x,x\rangle/2}$$
I tried the following code for the $A_2$ lattice, but I doesn't really do what its supposed to do
Q=QuadraticForm(QQ,2,[2,-1,2]); Q Q.theta_series(20)
I found the following code on OEIS, which gives the correct result:
ModularForms( Gamma1(3), 1, prec=81).0
| | 2 | retagged |
I am new to sage and trying to figure out how to calculate the series expansion of the theta function for an even lattice $L$, i.e. $$\Theta_L(q)=\sum_{x\in L} q^{\langle x,x\rangle/2}$$
I tried the following code for the $A_2$ lattice, but I doesn't really do what its supposed to do
Q=QuadraticForm(QQ,2,[2,-1,2]); Q Q.theta_series(20)
I found the following code on OEIS, which gives the correct result:
ModularForms( Gamma1(3), 1, prec=81).0
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