作者: N. K. Nikol’skii
DOI: 10.1007/978-94-009-5374-1_5
关键词:
摘要: Originally, Hankel and Toeplitz operators are defined as acting on l2 having matrices with entries depending only the sum or, respectively, difference of indices: \( \Gamma = {\left\{ {{\gamma_{n + k}}} \right\}_{n,k \geqslant 0}} \), T \left\{ {{t_{n - \right\}{}_{n,k 0} \). Many close relations such (matrices) to various problems algebra, analysis, differential equations were discovered early in last century. But spectral theories start their development late 50th. Now they joined within theory operators.