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arXiv 1006.0265math.AGmath.AT
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2-幂零实截猜想

2-Nilpotent Real Section Conjecture

Kirsten Wickelgren

摘要:

证明了R上的一个2-幂零截猜想:对于R上的几何连通曲线X,若其正规化的每个不可约分支都有R-点,则pi_0(X(R))由基本群与其Galois作用的最大2-幂零商决定,作为Jordan Ellenberg的一个阻塞的核.这意味着对于X光滑且适当的情形,X(R)^{+/-}由Gal(C(X))与其Gal(R)作用的最大2-幂零商决定,其中X(R)^{+/-}表示具有实切方向的实点集,从而证明了一个2-幂零双有理实截猜想.

英文摘要:

We show a 2-nilpotent section conjecture over R: for a geometrically connected curve X over R such that each irreducible component of its normalization has R-points, pi_0(X(R)) is determined by the maximal 2-nilpotent quotient of the fundamental group with its Galois action, as the kernel of an obstruction of Jordan Ellenberg. This implies that for X smooth and proper, X(R)^{+/-} is determined by the maximal 2-nilpotent quotient of Gal(C(X)) with its Gal(R)-action, where X(R)^{+/-} denotes the set of real points equipped with a real tangent direction, showing a 2-nilpotent birational real section conjecture.

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