Rencontre au bistrot | Tangente
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Stochastic optimization problems are specifically characterized by uncertainty in the data. The modeler has only imperfect knowledge of the data relating to the system under consideration or how it will evolve. Their values can, however, be characterized by probability distributions.

The arithmetic, quadratic, geometric and harmonic means (among many others) are all examples of a general family: the power means. They satisfy a well-known chain of inequalities.

The Rubik's Cube is a hugely popular puzzle among children and adults alike. This object, too, has its own group: all the isometries that leave it invariant.

Given the annual success of the Tangente High School Prize, the Littéramath association (litteramath.fr), in partnership with the APMEP and Tangente magazine, has decided to launch the Tangente Middle School Prize, which aims to promote mathematical culture through storytelling.