Hand holding a rod, and a description of a theorem of Euclid, detail of the portrait of Fra Luca Pacioli (1445-1517) with a student, 1496, painting attributed to Jacopo de' Barbari Hand holding a rod, ...
Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...
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