Each month opens with a beautiful image and a short text by Nicolas Hussenot explaining a random phenomenon—sometimes familiar, sometimes less so, but always surprising. Readers of Tangente probably know that random methods are used with great success to approximate deterministic quantities. But have you heard of the hazard function, or of the role randomness plays in imaging?
Each weekday brings readers a new mathematical puzzle. The answers appear on the final page, while detailed solutions are provided in a small booklet accompanying the calendar. The problems require no mathematical knowledge beyond the beginning of high school, yet they are interesting enough even for scientists. You will enjoy starting your day on public transport…

*2019 Mathematical Calendar: a daily challenge*.

Booklet and puzzles written by Anne Alberro Semerena, Radmila Bulajich Manfrino, José Antonio and Gomez Ortega, Presses universitaires de Grenoble, €15.**