Sonja Lyttkens

[2] She is also known for her work to make academia less hostile to women,[3] and for pointing out that the Swedish taxation system of the time, which provided an income deduction for husbands of non-working wives, pressured women even in low-income families not to work.

Her observations helped push Sweden into taxing married people separately from their spouses.

[7] She was the third woman to earn a doctorate in mathematics in Sweden, after Louise Petrén-Overton in 1911 and Ingrid Lindström in 1947.

[2] Although Sofya Kovalevskaya had become a full professor of mathematics in a private university in Stockholm in 1884,[8] women were forbidden from holding public university positions in Sweden until 1925,[8][3] and both Petrén and Lindström became schoolteachers.

Two of her children, Ulla Lyttkens [se] and Harald Hamrell, both became film actors and directors.