English: A non-trivial example of the "mountain climbing problem" in mathematics. Two dots, representing climbers, move from the left and right edges respectively and meet at the summit, while always remaining at equal y-heights. This is guaranteed to be possible, but can require unintuitive amounts of backtracking.
This is an animated SVG file. The dots are animated; the animation lasts 10 seconds, and then loops.
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Captions
A non-trivial example of the "[[mountain climbing problem]]"