{
  "aliases": null,
  "backlinks": null,
  "body": "\n## Statement\n\nLet $n$ be a positive integer. Then the $n$ smallest odd positive integers add up to the square of $n$:\n$$1 + 3 + 5 + \\dots + (2n - 1) = \\sum_{i=1}^{n} (2i - 1) = n^2.$$\n\n## Remarks\n\nFor $n = 1, 2, 3, 4$ the sums are $1, 4, 9, 16$.\nA proof by [[induction|0ASJVEFA9J]] uses $n^2 + (2n + 1) = (n + 1)^2$.\n",
  "commit": "bdea0329dc328964ec62566e23a0159c6ce93f2d",
  "front": {
    "kind": "statement",
    "msc": [
      "05A19"
    ],
    "name": "Sum of the first n odd positive integers",
    "role": "theorem",
    "sources": [
      {
        "locator": "source/s_induction_proofs.ptx:104",
        "url": "https://github.com/mitchkeller/applied-combinatorics/blob/ebd95d6bd59e23c633c65cf560bcb93efa912aae/source/s_induction_proofs.ptx#L104"
      }
    ],
    "tag": "9PESCNHE7Q",
    "uses": [
      "0ASJVEFA9J"
    ]
  },
  "kind": "statement",
  "link": "https://math2.tamnd.com/node/9PESCNHE7Q/",
  "links": [
    {
      "field": "uses",
      "target": "0ASJVEFA9J"
    }
  ],
  "markdown": "https://math2.tamnd.com/node/9PESCNHE7Q.md",
  "msc": [
    "05A19"
  ],
  "name": "Sum of the first n odd positive integers",
  "prov": null,
  "role": "theorem",
  "source": "https://github.com/tamnd/math2/blob/main/nodes/9PE/9PESCNHE7Q.md",
  "status": null,
  "tag": "9PESCNHE7Q",
  "uri": "m2://9PESCNHE7Q",
  "url": "https://math2.tamnd.com/wiki/sum-of-the-first-n-odd-positive-integers/",
  "writing": {
    "tag": "9PESCNHE7Q",
    "kind": "statement",
    "level": "W1",
    "next": [
      {
        "what": "edge about out",
        "note": "the concepts that the statement is about",
        "have": 0,
        "want": 1
      },
      {
        "what": "edge proves in",
        "note": "at least one proof node",
        "have": 0,
        "want": 1
      },
      {
        "what": "edge instance_of or illustrates in",
        "note": "one example that shows the statement at work",
        "have": 0,
        "want": 1
      },
      {
        "what": "explanation L2",
        "have": 0,
        "want": 1
      }
    ]
  }
}
