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1. Introduction. 1.1. Historical notes. 1.2. Normed linear spaces. 1.3. Strictly convex normed linear spaces. 1.4. Inner product spaces. 1.5. Orthogonalities in

Every mathematician working in Banaeh spaee geometry or Approximation theory knows, from his own experienee, that most "natural" geometrie properties may faH to

This book is an outcome of two Conferences on Ulam Type Stability (CUTS) organized in 2016 (July 4-9, Cluj-Napoca, Romania) and in 2018 (October 8-13, 2018, Tim

Inequalities play a central role in mathematics with various applications in other disciplines. The main goal of this contributed volume is to present several i

Semi-inner products, that can be naturally defined in general Banach spaces over the real or complex number field, play an important role in describing the geom