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Unequal
The Math of When Things Do and Don’t Add Up
Contributors
Formats and Prices
- On Sale
- Sep 2, 2025
- Page Count
- 400 pages
- Publisher
- Basic Books
- ISBN-13
- 9781541606555
Price
$32.00Price
$42.00 CADFormat
Format:
- Hardcover $32.00 $42.00 CAD
- ebook $18.99 $24.99 CAD
- Audiobook Download (Unabridged) $31.99
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“Eugenia Cheng has opened up my mind to the wondrous world of pure mathematics in a way that I never thought was possible.”―Willow Smith, singer and actress
A New Scientist Best Book of the Year
Math is famous for its equations: 1 + 1 = 2, a^2 + b^2 = c^2, or y = mx + b. Much of the time it can seem like that’s all mathematics is: following steps to show that what’s on one side of an equation is the same as what’s on the other.
In Unequal, Eugenia Cheng shows that’s just part of the story, and the boring part to boot. Mathematics isn’t only about showing how numbers and symbols are the same. It isn’t even just about numbers and symbols at all, but a world of shapes, symmetries, logical ideas, and more. And in that world, the boundary between things being equal and unequal is a gray area, or perhaps a rainbow of beautiful, vibrant, subtly nuanced color.
As Unequal shows, once you go over that rainbow, almost everything can be considered equal and unequal at the same time, whether it’s shapes (seen from the right perspective, a circle is the same as an ellipse), words (synonyms), or people—even numbers! It all depends on what features we care about. And it’s up to us what we do about it. That’s because mathematics isn’t a series of rules, facts, or answers. It’s an invitation to a more powerful way of thinking.
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“Her clever exploration of the meaning of “equals” helps us grasp its mathematical complexities – and the everyday dangers of assuming, for example, two people who score the same on an IQ test are equally intelligent.”New Scientist
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“Intriguing, thought-provoking, and occasionally dizzying, Unequal offers new ways of formulating solutions for all kinds of problems."Booklist
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"Eugenia Cheng has opened up my mind to the wondrous world of pure mathematics in a way that I never thought was possible."Willow Smith, singer and actress
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"Eugenia Cheng's writing is generous and precise, a soft-serve swirl of the universal and the particular. In a way that few mathematicians can, she writes for everyone."Ben Orlin, author of Math with Bad Drawings
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"Eugenia Cheng has done it again. Not only is she a great teacher of powerful mathematics: she shows us how understanding math can help us live better lives. Once you read this book, you'll have a new perspective on equality and difference, and why both matter so much."Stephon Alexander, author of The Jazz of Physics
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"Eugenia Cheng has done it again! With her usual brilliance she has caused us to question all that we thought was true about mathematics."Jo Boaler, author of Math-ish
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"Eugenia Cheng has humour, grace and a natural gift"Daniel Levitin, author of I Heard There Was a Secret Chord
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"Clear, clever and friendly...even at her most whimsical, she is rigorous and insightful"Alex Bellos, author of The Grapes of Math
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