context1: Professor Nikolsky made fundamental contributions to functional analysis, approximation of functions, quadrature <strong>formulas</strong>, enclosed functional spaces and their applications to variational solutions of partial differential <strong>equations</strong>. He created a large scientific school of functions' theory and its applications. He authored over 100 scientific publications, including 3 monographs, 2 college textbooks and 7 school textbooks.
context2: In 1946 Friis published his well-known analytic <strong>formula</strong> for transmission loss, the Friis transmission <strong>equation</strong>, which is still widely employed. In 1958 he retired but continued as a research consultant to the Hewlett-Packard Company as a friend of David Packard. He held 31 U.S. patents.