{
  "aliases": [
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  "body": "\n## Summary\n\nAn annulus is the region between two concentric circles, see the [[definition|0AJ0YVK743]].\nIn complex analysis, it is the open set $r \u003c |z - c| \u003c R$, and it is the natural domain of a Laurent series.\n",
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  "name": "Annulus",
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