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Unequal: The Maths of When Things Do and Don’t Add Up

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From Uniqueness to Set Theory and beyond, climb the mathematical ladder of sameness and difference with award-winning mathematician Eugenia Cheng

'Playful and deeply serious ... shows how exploring equality in maths may help the real world' NEW SCIENTIST

'Eugenia Cheng has humour, grace and a natural gift' DANIEL LEVITIN

'Clear, clever and friendly...even at her most whimsical, she is rigorous and insightful' ALEX BELLOS

At first glance, the concept of equality in maths seems unambiguous. When we see the equality sign, we think of 'solving for x' or balancing two sides of an equation or maybe even the many famous equations that make use of this elegant, innocuous symbol.

But between those parallel lines lies a mathematical playground of choice and abstraction, leading to far greater insight than you could have dreamed. As it turns out, sameness and difference, equality and inequality, are not nearly as straightforward as they seem.

Unequal explores the rich and rewarding interplay between sameness and difference, from numbers to manifolds to category theory and beyond in a glorious celebration of mathematics that will change the way you look at maths - and the world around you - forever.

Author: Cheng Eugenia
Publisher: PROFILE BOOKS
Pages: 400
ISBN: 9781805223061
Cover: Hardback
Edition Number: 1
Release Year: 2025
Eugenia Cheng is Scientist in Residence at the School of the Art Institute of Chicago and Honorary Fellow in pure mathematics at the University of Sheffield. She was educated at the University of Cambridge and did post-doctoral work at the Universities of Cambridge, Chicago and Nice. Since 2007 her YouTube lectures and videos have been viewed over a million times. A concert pianist, she also speaks French and Cantonese, and her mission in life is to rid the world of maths phobia. She is the author of The Art of Logic, How to Bake Pi and Beyond Infinity (all published by Profile Books), the last of which was shortlisted for the 2017 Royal Society Science Book Prize.

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