# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/kosaku-yosida
# Generated: 2026-08-13T21:39:27.229Z

schema: https://schema.org/Person
url: "https://fame.am/person/kosaku-yosida"
name: "Kōsaku Yosida"
slug: "kosaku-yosida"
description: "Kōsaku Yosida (吉田 耕作, Yosida Kōsaku; 7 February 1909, Hiroshima – 20 June 1990) was a Japanese mathematician who worked in the field of functional analysis. He is known for the Hille-Yosida theorem concerning C0-semigroups. Yosida studied mathematics at the University of Tokyo, and held posts at Osaka and Nagoya Universities. In 1955, Yosida returned to the University of Tokyo."
tagline: "Japanese mathematician (1909-1990)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/KosakuYosida_1969.jpeg?width=1200"
gender: "male"
country:
  name: "Japan"
  isoCode: "JP"
category:
  name: "Academics"
  slug: "academics"
profileType:
  name: "Academic"
  slug: "academic"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1909-02-07"
deathDate: "1990-06-20"
livingStatus: "DECEASED"
scores:
  popularity:           42.21
  momentum:             0
  historical:           7.217424
  currentAttention:     0
  sourceConfidence:     45
  profileCompleteness:  70
  trendDirection:       "FALLING"
ranks:
  global:   null
  country:  null
  category: null
sources:
  - url: "https://ru.wikipedia.org/wiki/%D0%98%D0%BE%D1%81%D0%B8%D0%B4%D0%B0%2C_%D0%9A%D0%BE%D1%81%D0%B0%D0%BA%D1%83"
    title: "Иосида, Косаку"
    type:  "WIKIPEDIA"
  - url: "https://arz.wikipedia.org/wiki/%D9%83%D9%88%D8%B3%D8%A7%D9%83%D9%88_%D9%8A%D9%88%D8%B3%D9%8A%D8%AF%D8%A7"
    title: "كوساكو يوسيدا"
    type:  "WIKIPEDIA"
  - url: "https://ca.wikipedia.org/wiki/K%C5%8Dsaku_Yosida"
    title: "Kōsaku Yosida"
    type:  "WIKIPEDIA"
  - url: "https://de.wikipedia.org/wiki/K%C5%8Dsaku_Yosida"
    title: "Kōsaku Yosida"
    type:  "WIKIPEDIA"
  - url: "https://en.wikipedia.org/wiki/K%C5%8Dsaku_Yosida"
    title: "Kōsaku Yosida"
    type:  "WIKIPEDIA"
  - url: "https://fr.wikipedia.org/wiki/K%C5%8Dsaku_Yosida"
    title: "Kōsaku Yosida"
    type:  "WIKIPEDIA"
  - url: "https://ja.wikipedia.org/wiki/%E5%90%89%E7%94%B0%E8%80%95%E4%BD%9C"
    title: "吉田耕作"
    type:  "WIKIPEDIA"
  - url: "https://pt.wikipedia.org/wiki/K%C5%8Dsaku_Yosida"
    title: "Kōsaku Yosida"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q382402"
    title: "Wikidata"
    type:  "WIKIDATA"

# bio (long form, separated for readability)
bio: |
  Imported from discovery source: wikidata-dump