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Nora Koparan tells the story of the first female professor of mathematics

Discover the meaning of the coloured squares on the cover of issue 13

Independent Sage's Christina Pagel, hyperbolic mindfulness and make-your-own Markov tweet feature in our autumn 2020 edition. Plus all your favourite puzzles & columns.

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Ride a phantom parabola into our spring 2019 issue. Billiards, maths, tiles, mistakes, plus all your favourite regulars.

How can we identify objects in photos, to diagnose cancer or predict the weather? Using gradients!