The Complex Angle in Normed Spaces

2nd International Conference on Mathematical Modeling in Physical Sciences 2013

物理学;数学

Thürey, Volker^1

Rheinstr. 91, 28199 Bremen, Germany^1

关键词: Complex angle;    Complex values;    Euclidean;    Euclidean Geometry;    Inner product space;    Normed spaces;    Normed vector spaces;    Orthogonal systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/490/1/012038/pdf
DOI  :  10.1088/1742-6596/490/1/012038

来源: IOP

【 摘 要 】

We consider a generalized angle in complex normed vector spaces. Its definition corresponds to the definition of the well known Euclidean angle in real inner product spaces. Not surprisingly it yields complex values as 'angles'. This 'angle' has some simple properties, which are known from the usual angle in real inner product spaces. But to do ordinary Euclidean geometry real angles are necessary. We show that even in a complex normed space there are many pure real valued 'angles'. The situation improves yet in inner product spaces. There we can use the known theory of orthogonal systems to find many pairs of vectors with real angles, and to do geometry which is based on the Greeks 2000 years ago.