In order to understand the stability of the SARS-CoV-2 coronavirus, both in droplets in suspension and on different contaminated surfaces, the prestigious New England Journal of Medicine [1] has published the first rigorous study under […]
This entry aims to show how the number of contacts between people influences the spread of an epidemic. Also, that it is enough to have a few “popular” people, who are in contact with many […]
Epidemiological and policy decision-making during the course of a pandemic depends heavily on the information available about the daily evolution of the actual number of infected people. A distinction must be made between the number […]
“Mathematics is everywhere” was the motto chosen by UNESCO to celebrate the International Mathematics Day in 2020. Unfortunately, mathematics were not present in the first moments of the COVID-19 coronavirus crisis: our authorities considered, without […]
In mathematics, modelling is an attempt to extract the significantly important aspects of a real situation and translate them into mathematical expressions and equations. Except in very simple processes, what is obtained will never be […]
Update 26 March Estimates for this entry were established using data from 18 March. Updated data show that our estimates for the number of deaths from Coronavirus in Spain gave lower values than those to […]
It is difficult to imagine in 18th century England how a lad working in the coal mines could become a member of the Royal Society and one of the most celebrated British mathematicians of his […]
Update (December 1, 2023) Few entries have had as much impact as this one. First of all Professor Paul Monsky of Brandeis University wrote the note he reports in his comments. It is a delightful […]
Wormholes A wormhole is a special class of solutions to the Einstein equations characterised by providing “shortcuts” in space-time. These shortcuts allow, at least theoretically, to pass from one region of space-time to another by […]
We have already built time machines We said in the previous post (Travelling through time (I)) that, according to Hawking, there are at least three possible ways to travel through time: 1. Getting close to […]
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