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The Hasse invariant of the Tate normal form E5 and the class number of Q(−5l)
Journal of Number Theory ( IF 0.7 ) Pub Date : 2021-04-20 , DOI: 10.1016/j.jnt.2021.03.006
Patrick Morton

It is shown that the number of irreducible quartic factors of the form g(x)=x4+ax3+(11a+2)x2ax+1 which divide the Hasse invariant of the Tate normal form E5 in characteristic l is a simple linear function of the class number h(5l) of the field Q(5l), when l2,3 modulo 5. A similar result holds for irreducible quadratic factors of g(x), when l1,4 modulo 5. This implies a formula for the number of linear factors over Fp of the supersingular polynomial ssp(5)(x) corresponding to the Fricke group Γ0(5).



中文翻译:

Tate范式E 5的Hasse不变量及其的类号-5

证明了形式的不可约四次因子的数量 GX=X4+一种X3+11一种+2个X2个-一种X+1个 划分了泰特范式的Hasse不变量 E5在特征l中是类号的简单线性函数H-5 领域的 -5, 什么时候 2个3 模5。类似的结果适用于的不可约二次因子 GX, 什么时候 1个4 模5。这意味着一个公式,用于计算线性因子的数量。 Fp 超奇异多项式 ssp5X 对应于Fricke组 Γ05

更新日期:2021-05-06
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