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Kiyoshi ItÅ was a Japanese mathematician. His major contribution to mathematics is now called ItÅ calculus. Its basic concept is the ItÅ integral, and among the most important results is ItÅ's lemma. ItÅ calculus facilitates mathematical understanding of random events. His theory is widely applied in various fields, and is perhaps best known for its use in financial mathematics.
Although the standard Hepburn romanization of his name is ItÅ, the spellings Itô, Itoh, or Ito are often seen in the West as well.
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