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Math for everyone
A new definition of the International System of Units
The conference held in Versailles in November 2018 changed four units of measurement, including the kilo. These new units will no longer depend on specific experiments. Their definitions will take effect in May 2019. What better opportunity to look back at the origins and evolution of our units of measurement?
MARC LECONTEJan 21, 2019
History and Culture
Steganography, cryptography's inseparable companion
While cryptography seeks to make information unintelligible, steganography aims to conceal the very existence of that information. The idea is to hide it within a drawing, image, text or sound.
LAURENT SIGNACJan 27, 2018
Math for everyone
Measuring without a standard: the challenge | Tangente
It is easy to measure the distance between two points in the plane using a ruler, or to weigh something using scales. Measuring areas or volumes requires a command of integral calculus. But what about concepts for which comparison with a standard is difficult, such as happiness?
Hervé LehningJul 16, 2020
Math for everyone
Preference modelling: voting and social choice | Tangente
We are all constantly called upon to make choices based on our preferences. Modelling them is a crucial step in decision support and is therefore of interest to the social sciences, particularly sociology.
Jacques BairMar 29, 2017