{
  "id": "2308.08664",
  "version": "v1",
  "published": "2023-08-16T20:29:38.000Z",
  "updated": "2023-08-16T20:29:38.000Z",
  "title": "On the structure of modal and tense operators on a boolean algebra",
  "authors": [
    "Guram Bezhanishvili",
    "Andre Kornell"
  ],
  "comment": "18 pages",
  "categories": [
    "math.LO",
    "math.GN"
  ],
  "abstract": "We study the poset NO(B) of necessity operators on a boolean algebra B. We show that NO(B) is a meet-semilattice that need not be distributive. However, when B is complete, NO(B) is necessarily a frame, which is spatial iff B is atomic. In that case, NO(B) is a locally Stone frame. Dual results hold for the poset PO(B) of possibility operators. We also obtain similar results for the posets TNO(B) and TPO(B) of tense necessity and possibility operators on B. Our main tool is Jonsson-Tarski duality, by which such operators correspond to continuous and interior relations on the Stone space of B.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-08-16T20:29:38.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03B45",
      "03B44",
      "06E25",
      "06E15",
      "54G05",
      "54B20",
      "18F70",
      "06D22"
    ],
    "keywords": [
      "boolean algebra",
      "tense operators",
      "possibility operators",
      "dual results hold",
      "necessity operators"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}