{
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  "body": "\n## Summary\n\n[[Degree of a field extension|0EAJ2XXADC]]: if $F$ is an extension of a [[field|04C5ZBG1WT]] $E$, then $[F:E]$ denotes the degree of the [[field extension|0EQWVHF3W5]] $F/E$. For example, $[\\mathbb C:\\mathbb R]=2$.\n\n[[Index of a subgroup|0DTXBQPA2S]]: if $H$ is a [[subgroup|0X1JXT47GA]] of a group $E$, then $[G:H]$ denotes the index of $H$ in $G$. The notation $\\lvert G:H\\rvert$ is also used.\n",
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        "locator": "Glossary of mathematical symbols, section Brackets \u003e Square brackets",
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    "tag": "G4T9WYV7BJ"
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  "markdown": "https://math2.tamnd.com/node/G4T9WYV7BJ.md",
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  "name": "Sqb2:",
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        "what": "edge defines in",
        "note": "at least one definition",
        "have": 0,
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        "what": "edge instance_of in",
        "note": "at least two examples",
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        "what": "edge not_instance_of in",
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        "what": "edge specializes both",
        "note": "the more general notions and the special cases",
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