{
  "id": "1501.00743",
  "version": "v1",
  "published": "2015-01-05T01:46:10.000Z",
  "updated": "2015-01-05T01:46:10.000Z",
  "title": "Identifying normal and congruence subgroups",
  "authors": [
    "Cheng Lien Lang",
    "Mong Lung Lang"
  ],
  "categories": [
    "math.NT"
  ],
  "abstract": "We give a simple algorithm that enables us to determine whether a subgroup of finite index of the Hecke group is normal.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-01-05T01:46:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "congruence subgroups",
      "identifying normal",
      "simple algorithm",
      "finite index"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015arXiv150100743L"
    }
  }
}