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
中科院分区:
文献类型:
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作者:
James Arthur Cipra;Todd Cochrane;Christopher G. Pinner
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.