In the previous chapter algorithms for computing the eigenvalues of symplectic matrices have been considered that are based on an elimination process for computing the butterfly form of symplectic matrix. Unfortunately, this approach is not suitable when dealing with large and sparse symplectic matrices as an elimination process can not make full use of the sparsity.

The moral to this story is that the good research scientist pays strict attention to any peculiar event and does not shrug off a mystery as just one of those things.

After early sparring, Spurs started to take control as the interval approached and twice came close to taking the lead. Terry blocked Rafael van der Vaart's header on the line and the same player saw his cross strike the post after Adebayor was unable to apply a touch.

While callout culture raises issues of shaming and risk, it has also raised consciousness around the implications of public speech on Twitter.