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歐拉猜想係由歐拉提出,從費馬最後定理引出嘅猜想,已經確定唔成立。
呢個猜想係講對每個大於2嘅整數,任何個正整數嘅次冪嘅和都唔係某正整數嘅次冪,亦即係以下不定方程無正整數解:
呢個猜想喺1966年被L. J. Lander和T. R. Parkin推翻。佢哋搵出嘅反例:
1988年,Noam Elkies搵出一個對製造反例嘅方法。佢畀出嘅反例中最細嘅係:
Roger Frye以Elkies嘅技巧用電腦直接搜索,搵出時最細嘅反例:
1999年Mark Dodrill搵出:
2000年嘅反例由S. Chase搵出:
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