Skill 2 of 14
In Progress

Stationary points

On the top of the hill, it is flat. Only momentarily flat, sure, but nevertheless flat. It’s a point where the curvature changes from upwards-pointing to downwards-pointing. At that point you are neither walking upwards nor downwards.

That’s of course also the case in the bottom of a valley or lake where the curvature changes from downwards-pointing to upwards-pointing.

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