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The Four-Color Theorem Has Haunted Mathematicians for Decades. It Just Got a Rare New Proof, but Some Still Long for a Simpler Solution
情報源: Smithsonian Magazine ·
The famous problem asks whether a map can be filled in with only four colors such that the same color never borders itself. It has been solved with the help of computers, but some experts suggest an elusive, short answer is out there
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Dementia with Lewy bodies: what you should know about the little-known, progressive brain disease
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