Intrinsic Diophantine approximation on manifolds: General theory
Intrinsic Diophantine approximation on manifolds: General theory
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流形上的本征丢番图近似:一般理论
DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
David Simmons
中科院分区:
文献类型:
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作者:
Lior Fishman;D. Kleinbock;Keith Merrill;David Simmons
We investigate the question of how well points on a nondegenerate $k$-dimensional submanifold $M \subseteq \mathbb R^d$ can be approximated by rationals also lying on $M$, establishing an upper bound on the "intrinsic Dirichlet exponent" for $M$. We show that relative to this exponent, the set of badly intrinsically approximable points is of full dimension and the set of very well intrinsically approximable points is of zero measure. Our bound on the intrinsic Dirichlet exponent is phrased in terms of an explicit function of $k$ and $d$ which does not seem to have appeared in the literature previously. It is shown to be optimal for several particular cases. The requirement that the rationals lie on $M$ distinguishes this question from the more common context of (ambient) Diophantine approximation on manifolds, and necessitates the development of new techniques. Our main tool is an analogue of the Simplex Lemma for rationals lying on $M$ which provides new insights on the local distribution of rational points on nondegenerate manifolds.
影响因子:
1.8
作者:
Ghosh A
通讯作者:
Ghosh A
影响因子:
1
作者:
Ghosh A
通讯作者:
Ghosh A
影响因子:
1.4
作者:
Badziahin D
通讯作者:
Badziahin D