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The Reunion of Broken Parts: Al-Khwarizmi and the Mathematics That Taught the World to Think
Paperback
Biographies GeneralGeneral MathematicsGeneral Middle Eastern History
Publisher: Independently Published
Published: Sep 20 2026
Pages: 290
Weight: 0.86
Height: 0.61 Width: 6.00 Depth: 9.00
Language: English
He is the most consequential mathematician most people have never heard of.
You use two of his words every day. One of them is algebra. The other is algorithm. Both come from one man, working in a library in ninth-century Baghdad, and his name has dissolved so completely into them that almost nobody who says either word knows there was ever a person there at all.
Muhammad ibn Musa al-Khwarizmi was given a narrow brief by a caliph around the year 820: write something practical about calculation, for the people who actually need it. He took it seriously. The short book he produced was written for judges settling estates, merchants dividing profits, and surveyors measuring land - and it did something no book had done before. It set out, completely and in plain language, how to find a quantity you do not yet know.
We know almost nothing about the man. No portrait. No letters. Not even an agreed birthplace: one early source puts his family two thousand miles from Baghdad, another puts them in a suburb, and a third gives him a religion his own writing contradicts. What survives is the work, a bookseller's catalogue compiled a century after his death, and a single manuscript in Strasbourg.
This book tells that story honestly, including the parts that are usually smoothed over. It says where the record is thin. It takes apart the famous legend about the House of Wisdom and the river running black with ink, and explains why the true version is better. It flags the scenes that are reconstructed, on the page, where you can see them.
- Follow the twelve-hundred-year chain from a Baghdad courtroom to the phone in your pocket
- Understand what algebra actually is, and why nobody had written it down before
- Meet the translators who carried it into Europe, and see what they left behind
- Learn why a ninth-century procedure met a standard of transparency most modern systems do not
- Recognize the move at the center of it all, and find you have been making it your whole life
This is a book for anyone who has ever stood in front of something tangled and needed to believe it had a shape.
The unknown is not a wall. Name it, and the work can begin.
Open the first page. The rest will find you.
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