5

x_{n, n - τ}^{(2)} = \sum_{v} x_{n, n - v} y_{n - v, n - τ}

${x^{(2)}_{n,n-\tau} = \sum_{v} x_{n,n-v}y_{n-v,n-\tau}}$

x_{n, n - τ}^{(2)} = \sum_{v} x_{n, n - v} y_{n - v, n - τ}

$x^{(2)}_{n,n-\tau} = \sum_{v} x_{n,n-v}y_{n-v,n-\tau}$

x_{n, n - τ}^{2}

$x^{{2}}_{n,n-\tau}$

\sum

$\sum$

Error