Seinosuke Toda

Seinosuke Toda (戸田 誠之助, Toda Seinosuke, born January 15, 1959) is a computer scientist working at the Nihon University in Tokyo.[1] Toda earned his Ph.D. from the Tokyo Institute of Technology in 1992, under the supervision of Kojiro Kobayashi.[2] He was a recipient of the 1998 Gödel Prize for proving Toda's theorem in computational complexity theory, which states that every problem in the polynomial hierarchy has a polynomial-time Turing reduction to a counting problem.[3]


  1. S. Toda Archived 2007-08-18 at the Wayback Machine at the Nihon University.
  2. Seinosuke Toda at the Mathematics Genealogy Project
  3. "1998 Gödel Prize". Retrieved 2010-12-05.

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