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Unknown Quantity is a
history of algebra, aimed at a general (i.e. not
particularly mathematical) readership.
The book was published in May 2006 by Joseph Henry Press of Washington, D.C.
A fuller description of the book can be found here.
A list of errata and comments (both mine and readers') is given here.
A paperback edition was published in May 2007.
If you would like to comment on the book, or if you think you have spotted an error, please get in touch with me via the email link on my home page (third paragraph from the top), or by postal mail through the publisher.
For details of how to buy the book, see my home page.