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Art gallery problem
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=== History === The question about how many vertices/watchmen/guards were needed, was posed to Chvátal by [[Victor Klee]] in 1973.{{sfnp|O'Rourke|1987|p=1}} Chvátal proved it shortly thereafter.{{sfnp|Chvátal|1975}} Chvátal's proof was later simplified by Steve Fisk, via a [[graph coloring|3-coloring]] argument.{{sfnp|Fisk|1978}} Chvátal has a more geometrical approach, whereas Fisk uses well-known results from [[Graph theory]].
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