# Theodore Seio Chihara

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**Theodore Seio Chihara** (March 14, 1929 – February 11, 2026) was an American mathematician working on [orthogonal polynomials](/source/Orthogonal_polynomials) who introduced [Al-Salam–Chihara polynomials](/source/Al-Salam%E2%80%93Chihara_polynomials), [Brenke–Chihara polynomials](/source/Brenke%E2%80%93Chihara_polynomials), and [Chihara–Ismail polynomials](/source/Chihara%E2%80%93Ismail_polynomials). His brother was composer [Paul Chihara](/source/Paul_Chihara). He earned his PhD from [Purdue University](/source/Purdue_University), where his thesis advisor was [Arthur Rosenthal](/source/Arthur_Rosenthal).[1] Chihara died on February 11, 2026, at the age of 96.[2]

## Publications

- Chihara, Theodore Seio (1978), [*An introduction to orthogonal polynomials*](https://books.google.com/books?id=IkCJSQAACAAJ), Vol. 13, Mathematics and its Applications, New York: Gordon and Breach Science Publishers, ISBN 978-0-677-04150-6. MR 0481884. Reprinted by Dover 2011
- Chihara, Theodore Seio (2001), "45 years of orthogonal polynomials: a view from the wings", *Journal of Computational and Applied Mathematics*. **133** (1): 13–21, [doi:10.1016/S0377-0427(00)00632-4](https://doi.org/10.1016/S0377-0427(00)00632-4). [ISSN 0377-0427](https://www.worldcat.org/issn/0377-0427). MR 1858267

## References

1. ["Theodore Seio Chihara"](https://www.mathgenealogy.org/id.php?id=16790). *Mathematics Genealogy Project*. Retrieved February 16, 2026.

1. [Theodore Seio Chihara](https://www.dignitymemorial.com/obituaries/bellevue-wa/theodore-chihara-12747946) Dignity Memorial

## Sources

- Askey, Richard; Ismail, Mourad E. H.; Van Assche, Walter (2001), "Ted Chihara and his work on orthogonal polynomials", *Journal of Computational and Applied Mathematics*. **133** (1): 1–11, [doi:10.1016/S0377-0427(00)00631-2](https://doi.org/10.1016/S0377-0427(00)00631-2). [ISSN 0377-0427](https://www.worldcat.org/issn/0377-0427). MR 1858266

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