A Birkhoff-Orthogonal Dehghan--Rooin Type Constant in Banach Spaces

Jia Du, Tingting Hu, Wenwen Zhang +1

For a real Banach space $X$. The Dehghan--Rooin magnitude compares the angular distance $\alpha [x,y]=\Vert x/\Vert x\Vert -y/\Vert y\Vert \Vert$ together with the skew angular distance $β[x,y]=\|x/\|y\|-y/\|x…