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Morley's "miracle"
A symmetry appearing out of nowhere, an equilateral triangle emerging amid the trisectors of a completely arbitrary triangle: that is the whole "miracle" of Morley and his theorem. The many proofs of this beautiful property are marvels of geometry and trigonometry.
196: a very curious number! | Tangente
A palindrome, or palindromic number, reads the same from right to left as from left to right, like 514,415. Here is a simple recipe for finding one.
Would you like a slice of a sphere? | Tangente
John Conway passed away this year, but the profound questions he raised across many fields remain as relevant as ever (see Tangente 194).
Frances Allen (1932–2020), computing pioneer | Tangente
Frances Allen was the first woman to receive the Turing Award. She died last August, on her 88th birthday.
Marvelous logarithms
Logarithms emerged at the very beginning of the 17th century, thanks to the eccentric Scottish mathematician and theologian John Napier. By dramatically speeding up calculations, they paved the way for extraordinary scientific advances, particularly in astronomy.
The unreasonable effectiveness of mathematics
In the latest physical theories, mathematical models have achieved such descriptive and predictive power that the question inevitably arises: is this mysterious fit a miracle, or does it have a deeper meaning?
Sudoku | Tangente
L'octogone presque magique | Tangente
Triangle magique | Tangente
L'étoile de Kaprekar | Tangente
Les carrés magiques de Charlemagne | Tangente
Le carré codé | Tangente
Le format était presque parfait | Tangente
Le partage de la croix de Lorraine | Tangente
Plus ou moins de la moitié ? | Tangente
Attention aux approximations !
Ne vous laissez pas tromper par votre tableur préféré ou votre calculatrice : le résultat n'est peut-être pas celui que vous croyez !
Sortir du Kioube | Tangente
L'Institut intergalactique est le temple de l'excellence, où exerce le redouté professeur Phi. Parfois, les énigmes d'un jeu d'évasion ressemblent à un cours…
Des excès, au nom des mathématiques | Tangente