自由原代数群的子群与函数域的Matzat猜想
Subgroups of free proalgebraic groups and Matzat's conjecture for function fields
摘要:
证明了自由原代数群的闭有限指数子群本身也是自由原代数群。这个结果的主要动机是在微分伽罗瓦论中的一个应用:一元函数域的绝对微分伽罗瓦群是一个自由原代数群。
英文摘要:
We show that a closed finite index subgroup of a free proalgebraic group is itself a free proalgebraic group. Our main motivation for this result is an application in differential Galois theory: The absolute differential Galois group of a one-variable function field is a free proalgebraic group.
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