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Hessin matriisi
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Finnish
Etymology
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.
Noun
fi misspelling Hessin matriisi
fi Hessen matriisi