Ida May Schottenfels

She was a student at the University of Chicago, earning a master's degree in mathematics in 1896.^[1] After working as a schoolteacher, she joined the New York Normal College as an instructor in 1901, and by 1913, she headed the mathematics department at Adrian College in Michigan.^[2] She was cited as one of the most "active" women mathematicians of the time.^[3] From 1891 to 1906 she gave 17 lectures at meetings of the American Mathematical Society and published three papers. She presented her paper "On a set of generators for certain substitution and Galois field groups" at the 1904 AMS meeting.^[1]

In group theory, Schottenfels was the first mathematician to prove that there exist two non-isomorphic simple groups of the same order, by demonstrating that there are two non-isomorphic simple groups of order 20,160.^[4]