l2 sequence space
= l2 sequence space
{title2=$\ell^2$}
The space $\ell^2$ consists of scalar sequences $x=(x_n)$ satisfying $\sum_n|x_n|^2<\infty$. With inner product $\langle x,y\rangle=\sum_nx_n\overline{y_n}$, it is a <Hilbert space>.
= l2 sequence space
{title2=$\ell^2$}
The space $\ell^2$ consists of scalar sequences $x=(x_n)$ satisfying $\sum_n|x_n|^2<\infty$. With inner product $\langle x,y\rangle=\sum_nx_n\overline{y_n}$, it is a <Hilbert space>.