{
  "aliases": null,
  "backlinks": null,
  "body": "\n## Definition\n\nLet $\\kappa$ be a [[cardinal|0EBACQFAZW]], and let $\\lambda \\ge \\kappa$ be an [[ordinal|0YSCSX5YZC]].\nThe cardinal $\\kappa$ is *$\\lambda$-supercompact* if there is an [[elementary embedding|CGH8C8EA9N]] $j \\colon V \\to M$, with $M$ a transitive class, such that:\n\n1. The critical point of $j$ is $\\kappa$, that is, $j(\\alpha) = \\alpha$ for $\\alpha \u003c \\kappa$ and $j(\\kappa) \u003e \\kappa$.\n2. $j(\\kappa) \u003e \\lambda$.\n3. $M$ is closed under $\\lambda$-sequences: every function from $\\lambda$ to $M$ is an element of $M$.\n\nThe cardinal $\\kappa$ is *supercompact* if it is $\\lambda$-supercompact for every ordinal $\\lambda \\ge \\kappa$.\n\n## Remarks\n\nA cardinal is $\\kappa$-supercompact if and only if it is measurable: the ultrapower embedding by a $\\kappa$-complete nonprincipal ultrafilter on $\\kappa$ satisfies the three clauses with $\\lambda = \\kappa$.\nSo the least measurable cardinal is $\\kappa$-supercompact, but it is not supercompact, since a supercompact cardinal has measurable cardinals below it.\nAn equivalent form uses ultrafilters on the set $P_\\kappa(\\lambda)$ of subsets of $\\lambda$ of size less than $\\kappa$.\nThe cardinal $\\kappa$ is $\\lambda$-supercompact if and only if there is a fine normal $\\kappa$-complete ultrafilter on $P_\\kappa(\\lambda)$.\nEvery supercompact cardinal is a Woodin cardinal.\n",
  "commit": "547b6eddb8f2feb8d579f2d633d22a27b7e132fc",
  "front": {
    "defines": "91GE4C1BC5",
    "kind": "definition",
    "msc": [
      "03E55"
    ],
    "name": "Supercompact cardinal",
    "sources": [
      {
        "url": "https://en.wikipedia.org/wiki/Supercompact_cardinal"
      }
    ],
    "tag": "SC3MSJRJ3S",
    "uses": [
      "0EBACQFAZW",
      "CGH8C8EA9N",
      "0YSCSX5YZC"
    ]
  },
  "kind": "definition",
  "link": "https://math2.tamnd.com/node/SC3MSJRJ3S/",
  "links": [
    {
      "field": "defines",
      "target": "91GE4C1BC5"
    },
    {
      "field": "uses",
      "target": "0EBACQFAZW"
    },
    {
      "field": "uses",
      "target": "CGH8C8EA9N"
    },
    {
      "field": "uses",
      "target": "0YSCSX5YZC"
    }
  ],
  "markdown": "https://math2.tamnd.com/node/SC3MSJRJ3S.md",
  "msc": [
    "03E55"
  ],
  "name": "Supercompact cardinal",
  "prov": null,
  "role": "",
  "source": "https://github.com/tamnd/math2/blob/main/nodes/SC3/SC3MSJRJ3S.md",
  "status": null,
  "tag": "SC3MSJRJ3S",
  "uri": "m2://SC3MSJRJ3S",
  "url": "https://math2.tamnd.com/wiki/supercompact-cardinal-definition/",
  "writing": {
    "tag": "SC3MSJRJ3S",
    "kind": "definition",
    "level": "W0",
    "next": [
      {
        "what": "a source with a locator",
        "have": 0,
        "want": 1
      }
    ]
  }
}
