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单词 HogattsTheorem
释义

Hogatt’s theorem


Hogatt’s theorem states that every positive integer can be expressed asa sum of distinct Fibonacci numbersMathworldPlanetmath.

For any positive integer, k+, there exists a unique positive integern so that Fn-1<kFn. We proceed by strong inductionMathworldPlanetmath on n. For k=0,1,2,3, the property is true as 0,1,2,3 are themselves Fibonacci numbers. Suppose k4 and that every integer less than k is a sum of distinct Fibonacci numbers. Let n be the largest positive integer such that Fn<k. We first note that if k-Fn>Fn-1 then

Fn+1k>Fn+Fn-1=Fn+1,

giving us a contradictionMathworldPlanetmathPlanetmath. Hence k-FnFn-1 and consequently the positive integer (k-Fn) can be expressed as a sum of distinct Fibonacci numbers. Moreover, this sum does not contain the term Fn as k-FnFn-1<Fn.Hence,k=(k-Fn)+Fn is a sum of distinct Fibonacci numbers and Hogatt’s theorem is proved by induction.

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更新时间:2025/5/4 6:26:27