Roswitha Blind
{{Short description|German mathematician and politician}}
{{Use dmy dates|cs1-dates=ly|date=August 2021}}
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Roswitha Blind (also published as Roswitha Hammer){{r|msn|mg}} is a German mathematician, specializing in convex geometry, discrete geometry, and polyhedral combinatorics, and a politician and organizer for the Social Democratic Party of Germany in Stuttgart.
Mathematics
As Roswitha Hammer, Blind completed a Ph.D. in 1974 at the University of Stuttgart. Her dissertation, Über konvexe Strukturen und die Beziehungen zur elementaren Konvexität, concerned convex geometry and discrete geometry and was supervised by Kurt Leichtweiss.{{r|mg}}
She is best known in mathematics for a 1987 publication with Peter Mani-Levitska in which, solving a conjecture of Micha Perles, she and Mani-Levitska proved that the combinatorial structure of simple polytopes is completely determined by their graphs.{{r|bm}} This result has been called the Blind–Mani theorem{{r|kalai}} or the Perles–Blind–Mani theorem.{{r|gruber}}
In a 1979 publication,{{r|blind}} she introduced a class of convex polytopes sometimes called the Blind polytopes, generalizing the semiregular polytopes and Johnson solids, in which all faces are regular polytopes.{{r|jbc}}
Politics
Blind became a city councillor in the Möhringen-Vaihingen district of Stuttgart in 2004,{{r|family}} stepping down from that seat in 2009 in order to become chair of the Social Democratic Party of Germany local council group.{{r|dank}} As councillor, in order to better serve the youth of her district, she became chair of a local football club, 1. FC Lauchhau-Lauchäcker, in 2006, also serving as president of the Stuttgart Sports Forum.{{r|fcll}}
She retired from politics in 2014,{{r|family}} and from her position with the football club in 2016.{{r|fcll}}
References
{{reflist|refs=
| last = Blind | first = R.
| doi = 10.1007/BF02566273
| issue = 2
| journal = Commentarii Mathematici Helvetici
| language = de
| mr = 535060
| pages = 304–308
| title = Konvexe Polytope mit kongruenten regulären -Seiten im ()
| volume = 54
| year = 1979}}
| last1 = Blind | first1 = Roswitha
| last2 = Mani-Levitska | first2 = Peter
| doi = 10.1007/BF01830678
| issue = 2-3
| journal = Aequationes Mathematicae
| mr = 921106
| pages = 287–297
| title = Puzzles and polytope isomorphisms
| volume = 34
| year = 1987}}.
| last = Gruber | first = Peter M. | author-link = Peter M. Gruber
| contribution = Edge graphs of simple polytopes determine the combinatorial structure; the Perles–Blind–Mani theorem
| isbn = 978-3-540-71132-2
| mr = 2335496
| pages = 275–277
| publisher = Springer | location = Berlin
| series = Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Sciences]
| title = Convex and Discrete Geometry
| volume = 336
| year = 2007}}
| last = Kalai | first = Gil | author-link = Gil Kalai
| contribution = Combinatorics and convexity
| contribution-url = https://www.ma.huji.ac.il/~kalai/co.pdf
| mr = 1404038
| pages = 1363–1374
| publisher = Birkhäuser, Basel
| title = Proceedings of the International Congress of Mathematicians, Vol. 1, 2 (Zürich, 1994)
| year = 1995}}
}}
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{{DEFAULTSORT:Blind, Roswitha}}
Category:Year of birth missing (living people)
Category:20th-century German mathematicians
Category:German women mathematicians
Category:University of Stuttgart alumni