What nationality was the Lax pair's namesake?
Lax pair In mathematics, in the theory of integrable systems, a Lax pair is a pair of time-dependent matrices or operators that satisfy a corresponding differential equation, called the "Lax equation". Lax pairs were introduced by Peter Lax to discuss solitons in continuous media. The inverse scattering transform makes use of the Lax equations to solve such systems.
Bartlett and Robertson Ethel Bartlett (1896–1978) and Rae Robertson (1893–1956), popularly known as Bartlett and Robertson, were a husband-and-wife classical piano duo who were credited with popularising two-piano music in Europe and the United States in the 1930s and 1940s through their extensive touring, recordings, and radio performances. Of English and Scottish background respectively, Bartlett and Robertson met during their studies at the Royal Academy of Music in London and married in 1921. Although they initially pursued solo careers, they teamed up as duo-pianists in the late 1920s and conducted annual international tours for over two decades. Several major composers of their era wrote duo-piano compositions especially for them, including Sir Arnold Bax, Benjamin Britten, Lennox Berkeley, and the Czech composer Bohuslav Martinů.