summation

Stream: new members

[Parivash]

How w can change or determine the starting point in summation?
for example :
$\sum_{i=0}^{+\infty}i*\theta_{i}$
is equal to
$$ 0 * \theta_{0} + \sum_{i=1}^{+\infty}i*\tehta_{i} $$

[Jireh Loreaux]

docs#tsum_eq_zero_add ?