"Version: 20190102"--Title page verso."A Morgan & Claypool publication as part of IOP Concise Physics"--Title page verso.Includes bibliographical references.1. Why relativity? -- 1.1. The Galilei invariance of Newtonian mechanics -- 1.2. The need for special relativity -- 1.3. The need for general relativity2. A first look at notions from geometry -- 2.1. Vectors and tensors -- 2.2. Curvilinear…