Two weeks ago, a modest-looking paper was uploaded to the arXiv preprint server with the unassuming title “On the invariant subspace problem in Hilbert spaces”. The paper is just 13 pages long and its ...

Gergonne’s pile problem, goes by numerous names and variations. In this article, we described how this problem, in the guise of a well-known card trick, can be explained and reproduced by a simple ...

While having coffee with an old friend, we talked about our observations with companies lately. He talked about complacency. About people taking short cuts. This was a typical conversation I’ve had ...