Since 2015, the Image des maths website (https://images.math.cnrs.fr) has featured a "picture-theorem puzzle" every Monday, taken from Geometry in Figures, a book published in 2011 by the young Russian mathematician Arseniy Akopyan (CreateSpace Independent Publishing Platform) and available in French as Figures sans paroles (Independently Published, 2019).
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First stated by the French engineer and physicist Henri Pitot (1695–1771), the theorem that bears his name concerns quadrilaterals with an inscribed circle (known as tangential quadrilaterals).
Catriona Agg (until recently also known as Catriona Shearer) is a British mathematics teacher from Cambridge.
Cédric Aubouy, a mathematical clown and founder of the L’île logique company, agreed to meet us to mark the publication of his first novel, Je ne sais pas ou la disparition des mathématiciens.
Mathematics and theatre—together? But to what end? What is at stake, what makes such a partnership work, and what does it require? The editors of Tangente put these questions to four enthusiasts who dared to take the plunge.
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