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Description
Primes of the Form x2+ny2Condition: BRAND NEW ISBN: 9781118390184 Year: 2013 Publisher: John Wiley & Sons Inc (US) Pages: 384 Description: An exciting approach to the history and mathematics of number theory ?. . . the author? s style is totally lucid and very easy to read . . . the result is indeed a wonderful story.? ? Mathematical Reviews Written in a unique and accessible style for readers of varied mathematical backgrounds, the Second Edition of Primes of the Form p =
Condition: BRAND NEWISBN: 9781118390184
Year: 2013
Publisher: John Wiley & Sons Inc (US)
Pages: 384
Description:
An exciting approach to the history and mathematics of number
theory
?. . . the author?s style is totally lucid and very
easy to read . . .the result is indeed a wonderful story.?
?Mathematical Reviews
Written in a unique and accessible style for readers of varied
mathematical backgrounds, the Second Edition of Primes of
the Form p = x2+ ny2
details the history behind how Pierre de Fermat?s work
ultimately gave birth to quadratic reciprocity and the genus theory
of quadratic forms. The book also illustrates how results of Euler
and Gauss can be fully understood only in the context of class
field theory, and in addition, explores a selection of the
magnificent formulas of complex multiplication.
Primes of the Form p = x2 +
ny2, Second Edition focuses on
addressing the question of when a prime p is of the form
x2 + ny2,
which serves as the basis for further discussion of various
mathematical topics. This updated edition has several new notable
features, including:
? A well-motivated introduction to the classical
formulation of class field theory
? Illustrations of explicit numerical examples to
demonstrate the power of basic theorems in various situations
? An elementary treatment of quadratic forms and genus
theory
? Simultaneous treatment of elementary and advanced
aspects of number theory
? New coverage of the Shimura reciprocity law and a
selection of recent work in an updated bibli
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4.7 ★★★★★
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Product Reviews
★★★★★ 5
Portable, comfy, and super sturdy
I LOVE THIS! I bought this trifold mattress for guests and occasional use, and it’s honestly become one of my favorite things. It unfolds smoothly, lays completely flat, and the foam is firm enough to support you but still comfortable to sleep on. When it’s folded, it’s super easy to move and doesn’t take up much space. The cover is easy to clean, and it doesn’t lose its shape after sleeping on it multiple nights. Great for guests, kids’ sleepovers, or even stretching and lounging. Definitely worth it.
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Reviewed in the United States on December 9, 2025
★★★★★ 5
Good trifold foldout
Color: White, Size: S06-Single
Great as an emergency pullout. Very comfortable, easy to setup and carry with the handles. Good as extra support as an exercise cushion too.
Mattress is a little hard but better than being too soft. Fabric could be softer or thicker, but not too bad quality.
May be good for a child's nap time. Fits good in closet for storing or accent ottoman in room.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 23, 2025
★★★★★ 1
DO NOT BUY.
Update: Amazon refunded me the price of the mattress as I can’t really send it back now that it isn’t compressed and we do not live anywhere near a UPS store. I reached out to the seller as it is listed as having a 5 year warranty. The seller has so far only initially offered me a 10% refund, so not honoring their warranty at all. I have refused this and asked for either a full replacement or a replacement section for the one that is defective. We will see if they stand by their warranty!
The package came SO compressed that one of the foam inserts never recovered. We opened it according to instructions, let it sit for 72 hours, and edges of foam were all so stuck together they did not rise properly. I had to take every piece out of both covers, manually pull apart the edges, and then let it rise again. We tried everything to get the third insert to be like the others- put it in a warm environment, put it in the bathroom where there is some more damp air, and still isn’t like the other two. It feels different as well- softer than the other two pieces. It’s like it is a totally different foam. It doesn’t fill out the cover completely and it is consequently very uncomfortable and not useable as one whole section is softer and thinner than the rest. I would like to return it but not sure how now that it is not compressed. Would not buy this product again. Very frustrating.
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Reviewed in the United States on December 30, 2025
★★★★★ 5
Firm but not hard
Color: Grey, Size: 4inch-Tw"
I sleep on this on the floor about 50% of the time because it’s so much more comfortable than my actual mattress. It doesn’t leave me with back or hip pain, it doesn’t sink so you never feel the ground like with an air mattress. It folds up to store under my real bed or I can fold in into a chair if I need. I did have to use a hair dryer to fluff up a few of the corners because they were taking a long time after opening but that’s to be expected.
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Reviewed in the United States on April 22, 2026
★★★★★ 4
Good mattress for company
Color: White, Size: S06-Single
This mattress is great for when you have a crowd coming to visit. It's easy to move around and it's pretty comfortable. I took it camping and slept well. It's not great as a chair unless you lean the back against a wall. Single bed sheets fit on it nicely.
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Reviewed in the United States on March 31, 2026
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