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# Ignote quantità: Storia reale e immaginaria dell'algebra

by

La protagonista di questa storia, lunga ben 4000 anni, è la x. L’ignota quantità che abbiamo incontrato per la prima volta nelle equazioni di primo grado fino alle più complicate formule matematiche. Ma cosa si nasconde dietro questo simbolo astratto? Tutta la storia dell’algebra, dalla comparsa del pensiero algebrico, tra il XVIII e il XVII secolo a.C., passando dalla
...more

## Get A Copy

Kindle Edition, 368 pages

Published
September 15th 2011
by Bollati Boringhieri
(first published May 2nd 2006)

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## Community Reviews

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Start your review of Ignote quantità: Storia reale e immaginaria dell'algebra

My original review—before I realised this John Derbyshire was also John Derbyshire, the racist/homophobe/theotard/hypocrite/all-round dipshit who writes for the National Review—was going to mention how the book takes a naïve attitude towards history that's refreshing in this age of nuance and relative rigor (something that's only remotely acceptable because the book isn't about, and ...more

Nov 24, 2007
Jesse
rated it
really liked it
·
review of another edition

Shelves:
history,
mathematics

There's an inherent difficulty in writing a book of this kind; a significant portion of the material that the author is expected to cover is simply out of the range of readers that lack an extensive background in mathematics. It is, in fact, worse than physics, in which metaphors can be used to give the reader some inkling of what's going on, even if they don't completely understand the reasons behind it. That being said, Derbyshire does a worthy job at a devilishly difficult task.

The first ...more

The first ...more

Oct 09, 2015
Jose Moa
rated it
really liked it
·
review of another edition

Shelves:
science,
mathematics

This book is another good work of John Derbyshire;the history of algebra from the babilonians to our days making things understable for those with a background of high school,it makes understable concepts as the complex numbers ,vector spaces ,quaternions ,algebraic structures as rings and gives a very elemental introduction to galois theory and algebraic topology

History.

At the start of the book he already mentioned he used only a few sources. What was it a large encyclopedia and a few texts on the history of math. Truly, that is how how to do these things.

to develop a balanced view of any subject, one must read widely on that subject, and maybe even in general. I do not get the sense that the author cared much to do this.

I though, am not ...more

Jan 28, 2011
Nur
is currently reading it
·
review of another edition

Recommended to Nur by:
being a Discrete Mathematics TA

Shelves:
non-fiction

"The story of algebra, is the story of civilization itself..."

I stumbled on this book somewhere at Amazon while searching for books to help me become a better TA in undergraduate Discrete Math class. The class is entirely in Japanese, so imagine studying sets and groups and lattices using symbols (read: kanji) you've never seen and had no clue on the reading and meaning.

I need a good English textbook to keep me sane, and being a fiction-lover, I certainly hope this book could lift my mood in the ...more

I stumbled on this book somewhere at Amazon while searching for books to help me become a better TA in undergraduate Discrete Math class. The class is entirely in Japanese, so imagine studying sets and groups and lattices using symbols (read: kanji) you've never seen and had no clue on the reading and meaning.

I need a good English textbook to keep me sane, and being a fiction-lover, I certainly hope this book could lift my mood in the ...more

The book falls between the stools of "popular math" and math treatments but is not rigorous enough to satisfy those interested in the latter and loses those drawn to the former in splurges of (incomplete) equations and hard to follow

On the plus side the potted histories of the various mathematicians encountered are entertaining and the book is reasonably well written.

It did serve the purpose of illustrating the arcane geography of modern algebra but didn't make me interested in it. Somewhat ...more

Ultimately this book does a good job for a popular mathematics book, a bit of history, a few interesting anecdotes, good overall approachable descriptions of some tricky concepts in algebra. But as good as the descriptions of ...more

Nov 17, 2008
Natbas
rated it
really liked it
·
review of another edition

Recommends it for:
people interested in ideas

I am reading a book on Maths, I am about to finish it, and in this book, I found a superb passage:

"I remain completely confident that the labor I have expended on the science presented here and which

hasd emanded a significant part of my life as well as the most strenuous application of my powers, will

not be lost. It is true that I am aware that the form which I have given the science is imperfect and must

be imperfect. But I know and feel obliged to state (though I run the risk of seeming ...more

However, there are two approaches to this history of algebra. One is for those who are tickled to death with Edwin Abbott’s Flatland and know the significance of 1,1,2,3,5,8,13,21,34,55,89,144,233,377, . . . The other is for folks who would like to know which ...more

Sep 02, 2012
Bryan Higgs
rated it
liked it
·
review of another edition

Shelves:
mathematics,
history-mathematics

I've read a number of "Math for the layman" books in recent years (including this author's Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics, which I reviewed here a while back: http://www.goodreads.com/review/show/...). This one covers a number of topics and history that I've seen covered in many of those other books.

Surprisingly, I have found the history sections of these books often to be more interesting than the math sections -- I say surprisingly because I ...more

Surprisingly, I have found the history sections of these books often to be more interesting than the math sections -- I say surprisingly because I ...more

I found it very interesting. It will be more interesting for you if you have heard of Descartes, Gauss, Riemann... and if you have a sense of what a function is, a matrix, a ring. You need not be able to manipulate them, but if you can visualize how they work, you will enjoy this book.

The ...more

There are math primers for each chapter of the history but one, and then there are the aforementioned history/concept chapters. Occasionally dry wit is added into the fray, with a healthy dose of originality and a fresh outlook. Certainly there are more userfriendly approaches to the discipline -- unless one is fluent in rings, ...more

Oct 21, 2007
Erica
rated it
liked it
·
review of another edition

Recommends it for:
math nerds

Shelves:
fall2007

10/21/07

I checked this out at the library. Wanting to know more history about mathematics (because I have started doing this monthly thing with my students called the "Mathematician of the Month" where they research a famous mathematician that has had some influence over whatever unit they/we are currently learning), I thought this book by Mr. Derbyshire would be a good choice.

BOOOORING. I did get some good tidbits out of it though. 1) Decartes invented the radical symbol for square roots. 2) ...more

I checked this out at the library. Wanting to know more history about mathematics (because I have started doing this monthly thing with my students called the "Mathematician of the Month" where they research a famous mathematician that has had some influence over whatever unit they/we are currently learning), I thought this book by Mr. Derbyshire would be a good choice.

BOOOORING. I did get some good tidbits out of it though. 1) Decartes invented the radical symbol for square roots. 2) ...more

The sections of the book I liked most were when he tied the developments in the discipline to what was happening in the world at large. I just wish there had been more of this - more contextualization of parallel developments in art, ...more

It was worth it though. Derbyshire is witty and the book was well written and very interesting. Not quite as good as Prime Obsession, but the math was easier for me to follow in that one, so the it ...more

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