scientific article; zbMATH DE number 1296803

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zbMath0951.46009MaRDI QIDQ4245006

Yongai Zheng

Publication date: 8 June 1999

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

inner product space orthogonality normed linear spaces angles Euclidean triangle congruence properties

Mathematics Subject Classification ID

Characterizations of Hilbert spaces (46C15)

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