{
  "aliases": [
    "least-upper-bound-property",
    "supremum-property",
    "dedekind-completeness"
  ],
  "backlinks": [
    {
      "field": "uses",
      "target": "047KEVEZ9Q"
    },
    {
      "field": "uses",
      "target": "068BZBXE0C"
    },
    {
      "field": "uses",
      "target": "06XY4X9430"
    },
    {
      "field": "uses",
      "target": "0A3GWZ86AY"
    },
    {
      "field": "uses",
      "target": "0B9ZQFMQNV"
    },
    {
      "field": "uses",
      "target": "0EDH403M21"
    },
    {
      "field": "uses",
      "target": "0M8TGGP9JP"
    }
  ],
  "body": "\n## Statement\n\nLet $S$ be a nonempty subset of the [[real numbers|08J2M1JYAG]] that is [[bounded above|0B5H2V4JW8]].\nThen $S$ has a [[supremum|0BTMQ04556]] in $\\mathbb{R}$.\n\n## Remarks\n\nIn the axiomatic approach, this is the axiom that distinguishes $\\mathbb{R}$ from the other ordered fields. In a construction of $\\mathbb{R}$, it is a theorem.\nThe ordered field $\\mathbb{Q}$ does not have this property: $\\{q \\in \\mathbb{Q} : q^2 \u003c 2\\}$ has no supremum in $\\mathbb{Q}$.\nThe axiom gives the [[existence of the infimum|0EDH403M21]] and the [[Archimedean property of the reals|0A3GWZ86AY]].\n\n## Explanations\n\n### L1 human\n\nThe real line has no holes.\nIf a set of real numbers has a ceiling, then there is a lowest ceiling, and this lowest ceiling is again a real number.\n",
  "commit": "f591989ed15704e9d8755a7a5a6426d73de7a3ae",
  "front": {
    "aliases": [
      "least-upper-bound-property",
      "supremum-property",
      "dedekind-completeness"
    ],
    "kind": "statement",
    "msc": [
      "26A03"
    ],
    "name": "Completeness axiom",
    "role": "axiom",
    "same_as": {
      "wikidata": "Q1254734",
      "wikipedia": "Least-upper-bound property"
    },
    "sources": [
      {
        "locator": "Statement for real numbers",
        "url": "https://en.wikipedia.org/wiki/Least-upper-bound_property"
      }
    ],
    "tag": "0AXWET80YW",
    "uses": [
      "08J2M1JYAG",
      "0B5H2V4JW8",
      "0BTMQ04556"
    ]
  },
  "kind": "statement",
  "link": "https://math2.tamnd.com/node/0AXWET80YW/",
  "links": [
    {
      "field": "uses",
      "target": "08J2M1JYAG"
    },
    {
      "field": "uses",
      "target": "0B5H2V4JW8"
    },
    {
      "field": "uses",
      "target": "0BTMQ04556"
    }
  ],
  "markdown": "https://math2.tamnd.com/node/0AXWET80YW.md",
  "msc": [
    "26A03"
  ],
  "name": "Completeness axiom",
  "prov": null,
  "role": "axiom",
  "source": "https://github.com/tamnd/math2/blob/main/nodes/0AX/0AXWET80YW.md",
  "status": null,
  "tag": "0AXWET80YW",
  "uri": "m2://0AXWET80YW",
  "url": "https://math2.tamnd.com/wiki/completeness-axiom/",
  "writing": {
    "tag": "0AXWET80YW",
    "kind": "statement",
    "level": "W0",
    "next": [
      {
        "what": "an inventory row",
        "note": "the row of the inventory that the node accounts for",
        "have": 0,
        "want": 1
      }
    ]
  }
}
