Emma Markovna Lehmer (née Trotskaia) (November 6, 1906 – May 7, 2007)[1] was an American mathematician known for her work on reciprocity laws in algebraic number theory.
While working for him at Berkeley finding pseudosquares, she met his son, her future husband Derrick H. Lehmer.
Lehmer did independent mathematical work, including a translation from Russian to English of Pontryagin's book Topological Groups.
Her publications were mainly in number theory and computation, with emphasis on reciprocity laws, special primes, and congruences.
[6][7] During World War II, she authored the paper "Simplified Rule for Determining Spacing in Train Bombing on Stationary Targets" and co-authored three others for the Statistical Laboratory at the University of California.