{
  "annotation_id": "7e143646-86be-4ec9-a67c-7203a733ad78",
  "date_created": "2026-03-02T18:01:14.085000Z",
  "date_modified": "2026-03-02T18:01:14.085000Z",
  "file_hash": "ff351a3ec3eec3fae0c415e519fa7bc675f36174e384fe2e56dc18e9bc306649",
  "private": false,
  "record": {
    "abstract": "A thought experiment first proposed by Sartori is analysed using the parallel\nvelocity addition formula of special relativity. The distances and proper-time\nintervals between some similarly defined spatial coincidence events are found\nto be widely different in different inertial frames. This relativity of space\nand time intervals is quite distinct from the well-known time-dilatation and\nlength contraction effects of special relativity. Sartori\u0027s claimed derivation\nof the parallel velocity addition formula, assuming relativistic time\ndilatation, based on the thought experiment, is shown to be fortuitous.",
    "arxiv_id": "physics/0610065",
    "authors": [
      "J. H. Field"
    ],
    "categories": [
      "physics.gen-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Relativistic velocity addition and the relativity of space and time   intervals",
    "url": "https://arxiv.org/abs/physics/0610065"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7bd4bd43-d514-4741-b8d9-644aff6a1ecd",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}