---
date: 2022-01-26 16:46
modification date: Wednesday 26th January 2022 16:46:19
title: congruence subgroup
aliases: [congruence subgroup, congruence, arithmetic subgroup]

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Last modified date: <%+ tp.file.last_modified_date() %>

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- Tags: 
	- #todo/untagged
- Refs:
	- #todo/add-references
- Links:
	- #todo/create-links 

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# congruence subgroup

![](attachments/2023-03-14-3.png)

![](attachments/2023-02-27congruence.png)

Defining lattices: ![](attachments/2023-02-27arithlattice.png)

![](attachments/Pasted%20image%2020220428130632.png)

# congruence subgroup of a number field



![](attachments/Pasted%20image%2020220126164626.png)