Heilbronn's conjecture on Waring's number (mod p)

Heilbronn's conjecture on Waring's number (mod p)
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DOI:
10.1016/j.jnt.2006.12.001
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发表时间:
2007-08
影响因子:
0.7
通讯作者:
James Arthur Cipra;Todd Cochrane;Christopher G. Pinner
James Arthur Cipra;Todd Cochrane;Christopher G. Pinner
中科院分区:
数学3区
文献类型:
--
作者:
James Arthur Cipra;Todd Cochrane;Christopher G. Pinner

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设p是素数k| p−1,t=(p−1)/k和γ(k,p)是s的最小值,使得每个数都是s的k次幂和(modp)。证明了海尔布龙猜想:当t>2时,γ(k,p)≠ k 1/2.更一般地,我们证明了对于任何正整数q,γ(k,p)<$C(q)k1/q,其中<$(t)<$q。一个可比的下限也给出了。我们还建立了当k(t)=2时γ(k,p)的精确值。例如,当t=3时,γ(k,p)=a+B−1,其中a>B>0是唯一整数,且a2+b2+ab=p;当t=4时,γ(k,p)=a−1,其中a>B>0是唯一整数,且a2+b2= p。
Let p be a prime k|p−1, t=(p−1)/k and γ(k,p) be the minimal value of s such that every number is a sum of s kth powers (modp). We prove Heilbronn's conjecture that γ(k,p)≪k1/2for t>2. More generally we show that for any positive integer q, γ(k,p)⩽C(q)k1/qfor ϕ(t)⩾q. A comparable lower bound is also given. We also establish exact values for γ(k,p) when ϕ(t)=2. For instance, when t=3, γ(k,p)=a+b−1 where a>b>0 are the unique integers with a2+b2+ab=p, and when t=4, γ(k,p)=a−1 where a>b>0 are the unique integers with a2+b2=p.