Gudrun Kalmbach

Gudrun Kalmbach (27 May 1937 – 25 July 2025) was a German mathematician and educator known for her contributions in the field of quantum logic and for the educational programmes she developed.

Life and career After teacher training in mathematics and chemistry, Kalmbach obtained a PhD at the University of Göttingen under the supervision of Hans Grauert on the topic of low-dimensional CW complexes in non-compact manifolds.

From 1967 to 1969, Kalmbach taught at the University of Illinois at Urbana–Champaign. After this she held positions as assistant professor at the University of Massachusetts Amherst (1970–1971) and Pennsylvania State University (1969–1975). In 1975, she qualified as professor at the University of Ulm, becoming the first female professor in geometry (at the chair of number theory and probability theory). She worked there until her retirement in 2002.

Kalmbach's research focused on manifolds, lattice theory and quantum structures.

In addition to her research career, Kalmbach invented in 1985 the talent program in STEM subjects (called MINT in Germany). Part of this is the yearly mathematics competition at the University of Ulm. From this, pupils were selected to attend a mathematics summer school with teaching in computer science, chemistry, physics and where they were introduced to university mathematics.

She was a founder of European Women in Mathematics, and a member and chair of the Emmy Noether Verein which supports female mathematicians.

Kalmbach last lived in Bad Wörishofen, where she died on 25 July 2025, at the age of 88.

Selected publications

Kalmbach H.E., G. ‘‘Archives KHE 1967-2019.‘‘ Bad Woerishofen, about 1000 volumes on science, mathematics, equal opportunity for women in mathematics Kalmbach, G. ‘‘Orthomodular Logic.‘‘ Z. Logik und Grundl. Math. 20 (1974), 395-406 Kalmbach (ed.), G. ‘‘Proceedings of the Lattice Theory Conference.‘‘ Universitaet Ulm, 1975 Kalmbach, G. ‘‘On some results in Morse Theory.‘‘ Canadian J. Math. 26 (1975), 88-105 Kalmbach, G. ‘‘Extension of topological Homology Theory to Partially Ordered Sets.‘‘ J. reine und angew. Math. 280 (1976), 134-156