Here are my solutions to various problems in Ray D'Inverno’s textbook *Introducing Einstein's Relativity*. The book does give answers to most problems at the back, but it doesn't provide the working behind them in most cases, so I'll post my own modest attempts here.

**Chapter 2 - The k-calculus**

**Chapter 5 - Tensor algebra**

5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.15, 5.16 (i-iv), 5.16 (v)

**Chapter 6 - Tensor calculus**