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Award-winning mathematician Eugenia Cheng offers a perspective-changing exploration of how mathematics can change the way we think. **New Scientist Book of the Year** “Clear, intelligent, and approachable... Even in her most playful moments, she is precise and insightful.” Alex Bellos 'Eugenia Cheng has humour, grace and a natural gift' DANIEL LEVITIN “Fun and seriously serious...shows how exploring equality in mathematics can benefit the real world” - _New Scientist_ When we see the equal sign, we usually see something clear and unambiguous: the problem on one side of the equation, and the solution on the other. We may need to rearrange some elements - balance the equation - to arrive at the solution, but it's quite obvious... isn't it? It turns out that between these two parallel lines lies something more interesting than just questions and answers. The equal sign is an invitation to a mathematical world full of choices and abstractions. By being open to different mathematical options and perspectives, you can discover much deeper insights than you ever imagined. Eugenia Cheng explores the rich and fruitful interplay between sameness and difference, offering us a new perspective on the world based on our choices and interpretations. Unequal is a wonderful celebration of mathematics, and will change the way you think - about mathematics, and about life in general.