Rudolf Ernest Langer (8 March 1894 – 11 March 1968) was an American mathematician, known for the Langer correction and as a president of the Mathematical Association of America.
He taught mathematics at Dartmouth College from 1922 to 1925.
[2] Langer's doctoral students include Nicholas D. Kazarinoff, Homer Newell, Jr., and Henry Scheffé.
Langer was a colleague of American physicist Carl David Anderson, discoverer of the positron, and was one of the few people to have read Dirac’s work on the anti-electron and made a connection.
He sent a short paper to Science making connections between the new observations and Dirac’s theories, putting forth imaginative claims such as that the proton is made of a neutron and a positron.