Biography:Rodica Simion
Rodica Eugenia Simion (January 18, 1955 – January 7, 2000) was a Romanian-American mathematician. She was the Columbian School Professor of Mathematics at George Washington University. Her research concerned combinatorics: she was a pioneer in the study of permutation patterns, and an expert on noncrossing partitions.
Biography
Simion was one of the top competitors in the Romanian national mathematical olympiads.[1] She graduated from the University of Bucharest in 1974, and immigrated to the United States in 1976.[2] She did her graduate studies at the University of Pennsylvania, earning a Ph.D. in 1981 under the supervision of Herbert Wilf.[2][3] After teaching at Southern Illinois University and Bryn Mawr College, she moved to George Washington University in 1987, and became Columbian School Professor in 1997.[2]
Recognition
She is included in a deck of playing cards featuring notable women mathematicians published by the Association of Women in Mathematics.[4]
Research contributions
Simion's thesis research concerned the concavity and unimodality of certain combinatorially defined sequences,[5] and included what Richard P. Stanley calls "a very influential result" that the zeros of certain polynomials are all real.[2]
Next, with Frank Schmidt, she was one of the first to study the combinatorics of sets of permutations defined by forbidden patterns; she found a bijective proof that the stack-sortable permutations and the permutations formed by interleaving two monotonic sequences are equinumerous, and found combinatorial enumerations of many permutation classes.[2][5] The "simsun permutations" were named after her and Sheila Sundaram, after their initial studies of these objects;[6][7] a simsun permutation is a permutation in which, for all k, the subsequence of the smallest k elements has no three consecutive elements in decreasing order.[8]
Simion also did extensive research on noncrossing partitions, and became "perhaps the world's leading authority" on them.[2]
Other activities
Simion was the main organizer of an exhibit about mathematics, Beyond Numbers, at the Maryland Science Center, based in part on her earlier experience organizing a similar exhibit at George Washington University.[2][9] She was also a leader in George Washington University's annual Summer Program for Women in Mathematics.[2] As well as being a mathematician, Simion was a poet and painter;[6][10] her poem "Immigrant Complex" was published in a collection of mathematical poetry in 1979.[11]
Selected publications
- Simion, Rodica (1984), "A multi-indexed Sturm sequence of polynomials and unimodality of certain combinatorial sequences", Journal of Combinatorial Theory, Series A 36 (1): 15–22, doi:10.1016/0097-3165(84)90075-X.
- Simion, Rodica; Schmidt, Frank W. (1985), "Restricted permutations", European Journal of Combinatorics 6 (4): 383–406, doi:10.1016/s0195-6698(85)80052-4.
- Simion, Rodica; Ullman, Daniel (1991), "On the structure of the lattice of noncrossing partitions", Discrete Mathematics 98 (3): 193–206, doi:10.1016/0012-365X(91)90376-D.
- Simion, Rodica (2000), "Noncrossing partitions", Discrete Mathematics 217 (1–3): 367–409, doi:10.1016/S0012-365X(99)00273-3.
See also
References
- ↑ Crapanzano, Theresa (January 20, 2000), "GW mourns after math professor passes away", The GW Hatchet, http://www.gwhatchet.com/2000/01/20/gw-mourns-after-math-professor-passes-away/.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Stanley, Richard P. (2000), "Rodica Simion: January 18, 1955 – January 7, 2000", Pi Mu Epsilon Journal 11: 83–86, http://www-math.mit.edu/~rstan/papers/pimuep.pdf.
- ↑ Rodica Simion at the Mathematics Genealogy Project
- ↑ Mathematicians of EvenQuads Deck 1, https://awm-math.org/publications/playing-cards/deck1/#simion, retrieved 2022-06-18
- ↑ 5.0 5.1 Wilf, Herbert (January 2000), Rodica Simion (1955–2000), Remarks at a special session of an AMS meeting in Washington, D.C., http://www.math.upenn.edu/~wilf/Remembrances/Simion.html.
- ↑ 6.0 6.1 Zeilberger, Doron (January 2000), RODICA SIMION (1955-2000): An (almost) Perfect Enumerator and Human Being, http://www.math.rutgers.edu/~zeilberg/mamarim/mamarimhtml/simion.html.
- ↑ Sundaram, Sheila (2002), "Reminiscences of Rodica Simion", Advances in Applied Mathematics 28 (3–4): 285–286, doi:10.1006/aama.2001.0785.
- ↑ Deutsch, Emeric; Elizalde, Sergi (2012), "Restricted simsun permutations", Annals of Combinatorics 16 (2): 253–269, doi:10.1007/s00026-012-0129-6.
- ↑ Bonin, Joseph E. (2002), "A remembrance of Rodica Simion", Advances in Applied Mathematics 28 (3–4): 280–281, doi:10.1006/aama.2001.0783.
- ↑ Kalai, Gil (January 7, 2000), Rodica Simion: Immigrant Complex, Combinatorics and more, http://gilkalai.wordpress.com/2010/01/07/rodica-simion-immigrant-complex/.
- ↑ Robson, Ernest M.; Wimp, Jet, eds. (1979), Against infinity: an anthology of contemporary mathematical poetry, Primary Press, pp. 65–66, ISBN 9780934982016.
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