The Thy-Angle and g-Angle in a Quasi-Inner Product Space

Pavle Miličić

In this note we prove that in a so-called quasi-inner product spaces, introduced a new angle (Thy-angle) and the so-called g-angle (previously defined) have many common characteristics. Important statements about parallelograms that apply to the Euclidean angles in the Euclidean space are also valid for the angles in a q.i.p. space (see Theorem 1).