concave - Chalkdust

A convex shape is one in which it is possible to connect any two points within the shape with a straight line that doesn’t leave the shape. The arrow-head on the right is concave, since the red line passes outside of the shape.

Sean Jamshidi

Sean is a PhD student researching geophysical fluid dynamics at UCL. He studies coastal outflows, but so far has been unable to persuade the department to send him on a research trip to the beach.

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We look back at last year's Black Mathematician Month, and give a preview of what to expect this October.
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