Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 46, No. 2, pp. 311320 (2005) 

A formula for angles between subspaces of inner product spacesHendra Gunawan, Oki Neswan and Wono SetyaBudhiDepartment of Mathematics, Bandung Institute of Technology, Bandung 40132, Indonesia, email: hgunawan@dns.math.itb.ac.id, email: oneswan@dns.math.itb.ac.id, email: wono@dns.math.itb.ac.idAbstract: We present an explicit formula for angles between two subspaces of inner product spaces. Our formula serves as a correction for, as well as an extension of, the formula proposed by Risteski and Tren{\v c}evski [R]. As a consequence of our formula, a generalized CauchySchwarz inequality is obtained. [R] Risteski, I. B.; Tren{\v c}evski, K. G.: Principal values and principal subspaces of two subspaces of vector spaces with inner product. Beitr. Algebra Geom. {\bf 42} (2001), 289300. Keywords: Angles between subspaces, canonical angles, generalized CauchySchwarz inequality Classification (MSC2000): 15A03, 51N20, 15A45, 15A21, 46B20 Full text of the article:
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