3-P^1_Q - {0,1,infty}的pi_1截面的幂零障碍
3-nilpotent obstructions to pi_1 sections for P^1_Q - {0,1,infty}
摘要:
本文研究了P^1_K -{0,1,infty}的Jacobian的哪些有理点可以提升到绝对伽罗瓦群上标准pi_1的几何3幂零元的截面上.这等价于求H^1(G_K)的元素的某些三重Massey积。对于K=Q_p或R,我们给出了一个完整的模2计算。这允许对K = Q进行一些模2计算。这些是乔丹·艾伦伯格的障碍物计算。
英文摘要:
We study which rational points of the Jacobian of P^1_K -{0,1,infty} can be lifted to sections of geometrically 3 nilpotent quotients of etale pi_1 over the absolute Galois group. This is equivalent to evaluating certain triple Massey products of elements of H^1(G_K). For K=Q_p or R, we give a complete mod 2 calculation. This permits some mod 2 calculations for K = Q. These are computations of obstructions of Jordan Ellenberg.
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