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Arbitrarily long gaps between the values of positive‐definite cubic and biquadratic diagonal forms
Journal of the London Mathematical Society ( IF 1.2 ) Pub Date : 2020-04-29 , DOI: 10.1112/jlms.12312
Luca Ghidelli 1
Affiliation  

For s = 3 , 4 , we prove the existence of arbitrarily long sequences of consecutive integers none of which is a sum of s nonnegative s th powers. More generally, we study the existence of gaps between the values N of diagonal forms of degree s in s variables with positive integer coefficients. We find: (1) gaps of size log N ( log log N ) 2 when s = 3 ; (2) gaps of size log log log N log log log log N if s = 4 and the form, up to permutation of the variables, is not equal to a ( c 1 x 1 ) 4 + b ( c 2 x 2 ) 4 + 4 a ( c 3 x 3 ) 4 + 4 b ( c 4 x 4 ) 4 .

中文翻译:

正定三次对角线形式和双二次对角线形式的值之间的任意长的间隙

对于 s = 3 4 ,我们证明了存在连续整数的任意长序列,这些序列都不是的和。 s 非负的 s 权力。更笼统地说,我们研究了价值观之间存在差距 ñ 对角形式的度 s s 具有正整数系数的变量。我们发现:(1)尺寸差距 日志 ñ 日志 日志 ñ 2 什么时候 s = 3 ; (2)大小差距 日志 日志 日志 ñ 日志 日志 日志 日志 ñ 如果 s = 4 并且形式,直到变量的排列,不等于 一种 C 1个 X 1个 4 + b C 2 X 2 4 + 4 一种 C 3 X 3 4 + 4 b C 4 X 4 4
更新日期:2020-04-29
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