Über das Kriterium von Cartan-Killing

Ohne Zusammenfassung     

Some Birkhoff interpolation problems on the roots of unity

The object of this note is to study three row almost Hermitian incidence matrices and to give sufficient conditions when the corresponding interpolation problem is regular on the roots of unity. In particular, a three row almost Hermitian matrix with only two nonzero entries in one row is regular on the cube roots of unity. Other situations are also examined in detail.