{
  "aliases": null,
  "backlinks": [
    {
      "field": "defines",
      "target": "C9WE6180A7"
    }
  ],
  "body": "\n## Summary\n\nThe amoeba of a complex polynomial in $n$ variables is the image of its zero set in $(\\C^\\times)^n$ under a logarithmic map.\nThis map takes the logarithm of the absolute value of each coordinate.\nThe name, given by Gelfand, Kapranov and Zelevinsky, comes from its shape: a body with thin tentacles going off to infinity.\nEach connected component of the complement is convex, and the number of these components is bounded by the [[Newton polytope|CYTTX8KHC8]].\nAmoebas link complex algebraic geometry with convex geometry and degenerate to tropical varieties, see [[tropical geometry|7YTC3BHK60]].\n\n## Explanations\n\n### L1 human\n\nTake the complex solutions of $1 + z + w = 0$ and record only the sizes $\\abs{z}$ and $\\abs{w}$, on a logarithmic scale.\nThe resulting region in the plane looks like a creature with three long arms.\nThe arms reach to infinity in three directions, where one of $z$, $w$ is tiny or both are huge.\nBetween the arms lie three convex holes.\nZooming out, the region shrinks to three rays from a point, the tropical line.\n",
  "commit": "ff8a40749dc16545e3d2fc637f6b0196e81d0bfa",
  "front": {
    "kind": "concept",
    "msc": [
      "14T10",
      "32A60"
    ],
    "name": "Amoeba",
    "same_as": {
      "wikidata": "Q2328765",
      "wikipedia": "Amoeba (mathematics)"
    },
    "sources": [
      {
        "url": "https://en.wikipedia.org/wiki/Amoeba_(mathematics)"
      }
    ],
    "tag": "PSK6VJQR9B"
  },
  "kind": "concept",
  "link": "https://tamnd.github.io/math2/node/PSK6VJQR9B/",
  "links": null,
  "markdown": "https://tamnd.github.io/math2/node/PSK6VJQR9B.md",
  "msc": [
    "14T10",
    "32A60"
  ],
  "name": "Amoeba",
  "prov": null,
  "role": "",
  "source": "https://github.com/tamnd/math2/blob/main/nodes/PSK/PSK6VJQR9B.md",
  "status": null,
  "tag": "PSK6VJQR9B",
  "uri": "m2://PSK6VJQR9B",
  "url": "https://tamnd.github.io/math2/wiki/amoeba/",
  "writing": {
    "tag": "PSK6VJQR9B",
    "kind": "concept",
    "level": "W0",
    "next": [
      {
        "what": "an inventory row",
        "note": "the row of the inventory that the node accounts for",
        "have": 0,
        "want": 1
      },
      {
        "what": "a source with a locator",
        "have": 0,
        "want": 1
      }
    ]
  }
}
