Normalizers of congruence groups in SL2(ℝ) and automorphisms of lattices-Reference-Cited by-同舟云学术

Normalizers of congruence groups in SL2(ℝ) and automorphisms of lattices

Published:2017-04-25 Issue:05 Volume:13 Page:1275-1300
ISSN:1793-0421
Container-title:International Journal of Number Theory
language:en
Short-container-title:Int. J. Number Theory

Author:

Zemel Shaul¹

Affiliation:

1. Einstein Institute of Mathematics, The Hebrew University of Jerusalem, Manchester Building, Edmund J. Safra Campus, Jerusalem 9190401, Israel

Abstract

We determine the normalizer in SL2(ℝ) of several families of congruence subgroups of SL2(ℤ). In addition, we show how these tools can be used to evaluate the groups of automorphisms and the discriminant kernels of a large family of isotropic lattices of signature (2,1).

Publisher

World Scientific Pub Co Pte Lt

Subject

Algebra and Number Theory

Link

https://www.worldscientific.com/doi/pdf/10.1142/S1793042117500701

Reference17 articles.

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4. Bielliptic and hyperelliptic modular curves X(N) and the group \mathrm Aut(X(N))

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