Hurwitz problem [SEP] named after
Hurwitz problem
In mathematics, the Hurwitz problem, named after Adolf Hurwitz, is the problem of finding multiplicative relations between quadratic forms which generalise those known to exist between sums of squares in certain numbers of variables.
There are well-known multiplicative relationships between sums of squares in two variables
(known as the Brahmagupta–Fibonacci identity), and also Euler's four-square identity and Degen's eight-square identity. These may be interpreted as multiplicativity for the norms on the complex numbers, quaternions and octonions
Robert Hurwitz
Robert Hurwitz (born in 1949) was president of Nonesuch Records from 1984 to 2017. He was named Chairman Emeritus of Nonesuch Records in January 2017. He previously ran the American operations of ECM Records, after beginning his career at Columbia Records. Hurwitz grew up in Los Angeles, where he was trained as a pianist and graduated from Alexander Hamilton High School in 1967, then went on to study at the University of California, Berkeley.
Founded as a classical label in 1964, Nonesuch expanded into the