By Harold M. Stark

ISBN-10: 0262690608

ISBN-13: 9780262690607

The vast majority of scholars who take classes in quantity idea are arithmetic majors who won't turn into quantity theorists. lots of them will, although, train arithmetic on the highschool or junior university point, and this publication is meant for these scholars studying to coach, as well as a cautious presentation of the normal fabric frequently taught in a primary path in trouble-free quantity idea, this publication contains a bankruptcy on quadratic fields which the writer has designed to make scholars take into consideration many of the "obvious" suggestions they've got taken with no consideration past. The ebook additionally features a huge variety of routines, lots of that are nonstandard.

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**Extra info for An Introduction to Number Theory**

**Sample text**

Then (2) and xz= y (p) i mply NO for some integer k. Si nce lxl < JP and I Y I < posit i ve integer, k 1 and = Jp, x2 + y 2 < 2p so k < 2 . Si nce k i s a ( 3) ns desired. This is o ur first enco unter with a member of the c la ss of Diophantine equation s We shall hav e a lot to sa y a bo ut t his e qua tio n for some sma ll va lue s o f l m l nnu arbitrary n. 32 Polynomials We close this section by studying the Diophantine equation x2 _ yz = p. (4) + The seemingly innocuous change of sign makes the problem trivial.

THE GRO UP (f)(n) We are now ready to complete our study of

We shall also call this extended homomorphism p. If fe R [x] and r e R, then p(f(r)) p(f)(p(r)). In particular, the function assigning to each polynomial with integral = = = 12. The Algebra of PolyJWmials 27 coefficients the polynomial with the same coefficients reduced modulo n is a homomorphism from Z [x] to Zn [x] . When fe Z [x] we write J for its image in Zn [x] ; J is the polynomial whose coefficients are the coefficients of f modulo n. Iff has an integral root r, then clearly r is a root of J, but the converse is false.

### An Introduction to Number Theory by Harold M. Stark

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