ball

introduction

%%visits: 6 Imagine a real ball but more abstracted, it doesn’t have to be a ball shape, but it has that name because it has a radius and points that live in the radius are the elements of the ball.

It is something that has a center,c₀ and a radius, r, and what is contained in the ball is governed by a [[metric]], all points that are at most r away.

There is the idea of disc in complex_analysis which is a specific metric. %% ==intuition ## rigour {{file:../figures/screenshot_20220210_122457.png}} %% ==exam clinic %% ==examples and non-examples %% ==resources tags math__metric_spaces_and_topologies:

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