## Senior Talk - Elizabeth Killinger

### WL 121

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Chvatal's Art Gallery Theorem and Fisk's Proof

The question of how many guards were needed to guard a simple polygon was posed by Victor Klee to Chvatal in 1973 during a math conference. Chvatal quickly proved the theorem, but Fisk later simplified the proof. We can solve this theorem using a 3-coloring argument proved by Fisk.