magic2.2

Published at 1118 × 490 in An odd card trick

Four classes of cards, tallied respectively by $\overline{\sigma}$,
$\sigma$, $\overline{\mu}$, and $\mu$,
result from two types of division: spectator
versus magician and face-up versus face-down.

David teaches and researches maths at King’s College London, with a focus on geometry. In his spare time he likes to make music and read poetry.
davidsheard.co.uk/    All articles by David

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