A visibility problem, how many guards are enough? @zachstar

Uploaded September 2019 | Updated September 2026, 2 weeks ago

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The video explains the proof of 'The Art Gallery Problem'. There are different versions of this problem (such as where guards can be placed) but we will focus on the most well known one where guards are forced to be in corners (and can see in all directions at once).

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A visibility problem, how many guards are enough?

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Is there (always) a line that passes through exactly 2 points?