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Wavelets and file compression | Tangente
In March, Yves Meyer received the Abel Prize for "his pivotal role in the development of the mathematical theory of wavelets." Emerging in the early 1980s, the field quickly became indispensable to image processing. The JPEG 2000 compression standard is based on it.
Betting on the presidential election: readers vs. the polls
Many of you took part in the challenge of coming as close as possible to the presidential election result. The winner is Élisabeth Pietravalle. Far behind, Ipsos proves to be the best polling institute.
Tangente turns 30: 30 ways to support it
The magazine Tangente, which is about to celebrate its 30th anniversary, has become an international benchmark and a fixture in the world of mathematics. Yet your support is more vital than ever to keep it going.
The luthiers' secret code decrypted | Tangente
The luthiers of the Parisian house Gand & Bernardel, a famous dynasty of violin makers from 1795 to the Second World War, had a code that let them work on their slips with complete discretion.
Logjam flaw in the HTTPS protocol | Tangente
A Franco-American team of researchers has just cheated… but for a good cause! Their goal? To verify the cryptographic mechanisms used to secure communications on the Internet.
Poincaré, geometry and robotics | Tangente
Mathematics, and geometry in particular, is an essential component of that most technical of fields: robotics. The concept of space, which the mathematician Henri Poincaré (1854–1912) explored in depth, lies at the heart of the robotics engineer's work.
Online algorithmsMaking decisions without knowing the future
The gift of foreseeing the future would obviously be a considerable advantage. Who has never dreamed of it? Without a crystal ball, mathematics allows us to make decisions that cost us relatively little, even though we do not know what the future holds. Welcome to the world of online algorithms.
En toute logique : problème de déduction | Tangente
La pyramide des différences : puzzle numérique | Tangente
Les moyennes de l'année : complétez le triangle numérique
Quadrillages multiples — Chemins sur grille | Tangente
Un lieu étonnant : problème de géométrie | Tangente
Saurez-vous trouvez la construction qui permet d'obtenir le cercle rose ?
Chamboul'tout | Tangente Magazine
Triangle de Pascal (1) : propriété des sommes | Tangente
Systèmes de numération renversants | Tangente
D'autres systèmes originaux de numération ont vu le jour par le passé.
Triangle de Pascal (2) : lignes impaires | Tangente
Coordonnées de l'année : défi arithmétique | Tangente
Partage du disque et triangle de Pascal | Tangente
Mille et une lampes : problème de logique | Tangente
Folle soirée au Lieu géométrique | Tangente
L'Institut intergalactique est le temple de l'excellence, où exerce le redouté professeur Phi. Même dans une soirée étudiante, un peu de logique ne peut pas faire de mal...
Le triangle de Pascal à plusieurs facettes | Tangente
Les combinaisons du triangle de Pascal dévoilent des séquences numériques intéressantes, qui évoquent les nombres triangulaires ou encore la fameuse suite de Fibonacci.
Construire des ellipses à la main | Tangente
La vie de Turing : une approche originale | Tangente