"Hessin matriisi" meaning in Finnish

{
  "etymology_text": "From the ambiguity of the English Hessian matrix: had Ludwig Otto Hesse's surname been either Hess or Hessi, the English term would still have been Hessian matrix and the Finnish genitive (in both cases) would have been Hessin.",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "misspelling",
        "head": "Hessin matriisi"
      },
      "expansion": "Hessin matriisi",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Hessen matriisi"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Finnish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Misspelling of Hessen matriisi."
      ],
      "id": "en-Hessin_matriisi-fi-noun-gnFnHLUn",
      "links": [
        [
          "Hessen matriisi",
          "Hessen matriisi#Finnish"
        ]
      ],
      "tags": [
        "alt-of",
        "misspelling"
      ]
    }
  ],
  "word": "Hessin matriisi"
}

{
  "etymology_text": "From the ambiguity of the English Hessian matrix: had Ludwig Otto Hesse's surname been either Hess or Hessi, the English term would still have been Hessian matrix and the Finnish genitive (in both cases) would have been Hessin.",
  "head_templates": [
    {
      "args": {
        "1": "fi",
        "2": "misspelling",
        "head": "Hessin matriisi"
      },
      "expansion": "Hessin matriisi",
      "name": "head"
    }
  ],
  "lang": "Finnish",
  "lang_code": "fi",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Hessen matriisi"
        }
      ],
      "categories": [
        "Finnish entries with incorrect language header",
        "Finnish misspellings",
        "Finnish non-lemma forms",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Misspelling of Hessen matriisi."
      ],
      "links": [
        [
          "Hessen matriisi",
          "Hessen matriisi#Finnish"
        ]
      ],
      "tags": [
        "alt-of",
        "misspelling"
      ]
    }
  ],
  "word": "Hessin matriisi"
}