"null infinity" meaning in English

See null infinity in All languages combined, or Wiktionary

Noun

Forms: null infinities [plural]
Etymology: From the physics concept of "at infinity" or "far", where fields are small, and the math concept of null set. Ironically, a null infinity may be neither far nor a null set. Head templates: {{en-noun}} null infinity (plural null infinities)
  1. In a closed space-time, especially for an Einstein cylinder, null infinity for a given point is the limit of convergence of the light cone most distant from the given point. That is, it is the limit of a set of points that each have a time-like separation from every point that has a space-like separation from the given point.
    Sense id: en-null_infinity-en-noun-S-w6gGBu Categories (other): English entries with incorrect language header

Inflected forms

Download JSON data for null infinity meaning in English (1.2kB)

{
  "etymology_text": "From the physics concept of \"at infinity\" or \"far\", where fields are small, and the math concept of null set. Ironically, a null infinity may be neither far nor a null set.",
  "forms": [
    {
      "form": "null infinities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "null infinity (plural null infinities)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "In a closed space-time, especially for an Einstein cylinder, null infinity for a given point is the limit of convergence of the light cone most distant from the given point. That is, it is the limit of a set of points that each have a time-like separation from every point that has a space-like separation from the given point."
      ],
      "id": "en-null_infinity-en-noun-S-w6gGBu",
      "links": [
        [
          "closed",
          "closed"
        ],
        [
          "space-time",
          "space-time"
        ],
        [
          "Einstein cylinder",
          "Einstein cylinder"
        ],
        [
          "light cone",
          "light cone"
        ],
        [
          "time-like",
          "time-like"
        ],
        [
          "separation",
          "separation"
        ],
        [
          "space-like",
          "space-like"
        ]
      ]
    }
  ],
  "word": "null infinity"
}

{
  "etymology_text": "From the physics concept of \"at infinity\" or \"far\", where fields are small, and the math concept of null set. Ironically, a null infinity may be neither far nor a null set.",
  "forms": [
    {
      "form": "null infinities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "null infinity (plural null infinities)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "In a closed space-time, especially for an Einstein cylinder, null infinity for a given point is the limit of convergence of the light cone most distant from the given point. That is, it is the limit of a set of points that each have a time-like separation from every point that has a space-like separation from the given point."
      ],
      "links": [
        [
          "closed",
          "closed"
        ],
        [
          "space-time",
          "space-time"
        ],
        [
          "Einstein cylinder",
          "Einstein cylinder"
        ],
        [
          "light cone",
          "light cone"
        ],
        [
          "time-like",
          "time-like"
        ],
        [
          "separation",
          "separation"
        ],
        [
          "space-like",
          "space-like"
        ]
      ]
    }
  ],
  "word": "null infinity"
}

This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2024-05-03 from the enwiktionary dump dated 2024-05-02 using wiktextract (f4fd8c9 and c9440ce). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.

If you use this data in academic research, please cite Tatu Ylonen: Wiktextract: Wiktionary as Machine-Readable Structured Data, Proceedings of the 13th Conference on Language Resources and Evaluation (LREC), pp. 1317-1325, Marseille, 20-25 June 2022. Linking to the relevant page(s) under https://kaikki.org would also be greatly appreciated.