{
  "id": "math/0612240",
  "version": "v2",
  "published": "2006-12-09T19:15:38.000Z",
  "updated": "2007-08-15T02:40:34.000Z",
  "title": "The spectrum of characters of ultrafilters on omega",
  "authors": [
    "Saharon Shelah"
  ],
  "categories": [
    "math.LO",
    "math.GN"
  ],
  "abstract": "We show the consistency of the set of regular cardinals which are the character of some ultrafilter on omega is not convex. We also deal with the set of pi chi-characters of ultrafilters on omega.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2007-08-15T02:40:34.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ultrafilter",
      "regular cardinals",
      "pi chi-characters"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2006math.....12240S"
    }
  }
}