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  "body": "\n## Summary\n\nUsed for emphasizing that several equations have to be considered as simultaneous equations; for example, $\\textstyle \\begin{cases}2x+y=1\\\\3x-y=1\\end{cases}$.\n\nPiecewise definition; for example, $\\textstyle |x|=\\begin{cases}x\u0026\\text{if }x\\ge 0\\\\-x\u0026\\text{if }x\u003c 0\\end{cases}$.\n\nUsed for grouped annotation of elements in a formula; for example, $\\textstyle \\underbrace{ (a,b,\\ldots,z) }_{26}$, $\\textstyle \\overbrace{ 1+2+\\cdots+100 }^{=5050}$, $\\textstyle \\left.\\begin{bmatrix}A\\\\B\\end{bmatrix}\\right\\} m+n\\text{ rows}$\n",
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    "kind": "concept",
    "name": "Single brace",
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      {
        "locator": "Glossary of mathematical symbols, section Brackets \u003e Braces",
        "mention": "wikipedia://en/73634#KRX7",
        "note": "adopted",
        "sections": [
          "Summary"
        ],
        "wikipedia": "en:73634@r1376316324"
      }
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    "tag": "BVWJGVVJB9"
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  "markdown": "https://math2.tamnd.com/node/BVWJGVVJB9.md",
  "msc": null,
  "name": "Single brace",
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    "tag": "BVWJGVVJB9",
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      {
        "what": "edge defines in",
        "note": "at least one definition",
        "have": 0,
        "want": 1
      },
      {
        "what": "edge instance_of in",
        "note": "at least two examples",
        "have": 0,
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      },
      {
        "what": "edge not_instance_of in",
        "note": "at least one non-example",
        "have": 0,
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      },
      {
        "what": "edge specializes both",
        "note": "the more general notions and the special cases",
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