Received October 14th, 2021. Classical error-correction is the process by which data is protected from being corrupted by noise. In its simplest form we wish to protect a sequence of zeros and ones which are either being stored or transmitted. A repetition code gives a simple protection against a bit flip error in which a […]
(Mathematical Institute, University of Oxford). Received 22 Feb, 2021. We live in a connected world where people, goods, information, and diseases travel from one region to the next. In the years of COVID, a particularly dramatic example of this propagation phenomenon is, of course, the transmission of the coronavirus from a single seed location (Wuhan,
(NL English translation, with permission from El País, of the article Cómo visitar dos millones de estrellas en el menor tiempo posible published on December 14, 2020, in the “Café y Teoremas” series) The Gaia project of the European Space Agency (ESA) has cataloged 2,079,471 stars. Could we find a route to visit them all,
