To the problem on the basis property of the system \(\{ \exp (iant)\sin (nt)\}\)
The author proves that the system \( \{e^{ia n x }\sin nx\}_1^\infty \) cannot be uniformly minimal in \(L^2(0,\pi)\) if \(\Im a\neq 0\).
scientific article; zbMATH DE number 1099451