Dentable

Seatbelts, airbags, collapsible steering columns, dentable windscreens, squashable fascias and squashable front and rear ends have all added to safety, but how? To answer that you will need to recall some GCSE physics and learn more formal ways of expressing it — using equations and graphs.

It will be useful to observe that a nonempty bounded set C is dentable if its closed convex hull is dentable...