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Tien-Yien Li

American mathematician (1945–2020)

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Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionAug 31, 2026
Entity authorityQ7801025 ↗
Source-derived summary

Tien-Yien Li (Chinese: 李天岩; June 28, 1945 – June 25, 2020) was a Taiwanese mathematician. He was a University Distinguished Professor of Mathematics and University Distinguished Professor Emeritus at Michigan State University. There, he spent 42 years and supervised 26 Ph.D. dissertations.

Early life and education

Li was born on June 28, 1945, in Sha County, Fujian Province, China. At age three, he was brought to Taiwan by his parents. He earned his B.S. in mathematics from National Tsing Hua University in 1968. Li received his doctorate in 1974 from University of Maryland under the guidance of James Yorke.

Academic career

Li joined the faculty of the Department of Mathematics at Michigan State University in 1976 and was promoted to the rank of full professor in 1983. He retired as a University Distinguished Professor Emeritus in 2018 after spending 42 years at the university. Li and his supervisor James Yorke published a paper in 1975 entitled Period three implies chaos, in which the mathematical term chaos was coined.

Editorial summary

This brief starts where responsible research should: with the source description of “Tien-Yien Li” as american mathematician (1945–2020). Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA productive starting point for separating a subject’s documented career from later reputation and commemoration. The current lead gives the account dated anchors—1945, 2020, 1968, 1974—that can be checked directly. The linked authority record independently contributes the date 1945-01-01. The account is most persuasive where Tien-Yien, American and mathematician can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the people & ideas register because the source frames it as american mathematician (1945–2020). Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

The entry’s evidential value lies in the named roles, institutions and publications that can be tested against primary documentation. The source revision retrieved here is dated Aug 31, 2026. The linked authority identifier is Q7801025. VIAF identifies the subject as 28158978692355790436. 2 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1945, 2020, 1968 and 1974.

Critical limits

A concise life account rarely captures disputed attribution, private networks or the changing language used to describe a career. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Read biographical claims against dates, named institutions and the cited references. Distinguish a subject’s later reputation from evidence produced during their lifetime.

Best used for
  • Establishing names and roles
  • Building a first chronology
  • Locating cited institutions
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Personal papers, civil or court records, institutional files and the scholarship cited by the source.

Three-step research path

  1. Establish the record: confirm the title “Tien-Yien Li”, its source revision and the description used here.
  2. Expand the search: follow Tien-Yien Li primary sources, Tien-Yien Li archive and Tien-Yien research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “Tien-Yien Li”?
  2. How has the subject’s reputation changed across later accounts?
  3. Which primary records establish identity, chronology and institutional ties?
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Source & attribution

This entry incorporates text from “Tien-Yien Li” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.