Download e-book for iPad: Applied Number Theory by Harald Niederreiter, Arne Winterhof

By Harald Niederreiter, Arne Winterhof

ISBN-10: 3319223208

ISBN-13: 9783319223209

ISBN-10: 3319223216

ISBN-13: 9783319223216

This textbook successfully builds a bridge from simple quantity idea to contemporary advances in utilized quantity thought. It offers the 1st unified account of the 4 significant components of program the place quantity conception performs a primary position, particularly cryptography, coding concept, quasi-Monte Carlo equipment, and pseudorandom quantity new release, permitting the authors to delineate the manifold hyperlinks and interrelations among those areas.

Number concept, which Carl-Friedrich Gauss famously dubbed the queen of arithmetic, has consistently been thought of a truly attractive box of arithmetic, generating gorgeous effects and stylish proofs. whereas simply only a few real-life functions have been identified long ago, this present day quantity concept are available in way of life: in grocery store bar code scanners, in our vehicles’ GPS platforms, in on-line banking, etc.

Starting with a short introductory direction on quantity conception in bankruptcy 1, which makes the publication extra obtainable for undergraduates, the authors describe the 4 major program parts in Chapters 2-5 and provide a glimpse of complex effects which are offered with out proofs and require extra complicated mathematical abilities. within the final bankruptcy they assessment a number of extra purposes of quantity concept, starting from check-digit structures to quantum computation and the association of raster-graphics memory.

Upper-level undergraduates, graduates and researchers within the box of quantity thought will locate this ebook to be a useful resource.

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19 For odd m 2 N, prove that the sum of the elements of every complete residue system modulo m is divisible by m. n/. n/. 22 Let m; n 2 N be such that every prime factor of m is also a prime factor of n. n/. m/ is even for all integers m 3. mod 13/. 25 Find all quadratic residues modulo 13 in the least residue system modulo 13. 26 For every prime number p 5, prove that the sum of the quadratic residues modulo p in any complete residue system modulo p is divisible by p. 27 Let p be an odd prime number and let a be a quadratic residue modulo p.

4 Trace Map and Characters We introduce an important map from a finite field to a subfield which will turn out to be useful, for instance, in the construction of characters of finite fields later in this subsection. In order to simplify the notation, we write F D Fq for a given finite field and K D Fqn with n 2 N for a finite extension field of F. We start from an element Pn 1 qj ˛ 2 K and we consider the element D jD0 ˛ which, as it stands, lies in K. 30 shows that 2 Fq D F. 48 Let F D Fq be an arbitrary finite field and let K D Fqn with n 2 N be a finite extension field of F.

K 1/. 2(ii) implies that either h 1 D 0 or k 1 D 0, but both alternatives yield contradictions to the minimality of p. 8 is called the characteristic of the finite field F. More generally, if for an arbitrary field F there exists a prime number p such that p 1 D 0 2 F, then p is called the characteristic of F. 5 has characteristic p. We remark for the sake of completeness that the fields Q, R, and C have characteristic 0 by definition, but there will be no need for us to use this terminology. Let us consider not only n 1, but more generally, for every field F, for every n 2 N, and for every a 2 F, let us put n aDaCaC ƒ‚ „ Ca2F … n summands and furthermore 0 a D 0 2 F.

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Applied Number Theory by Harald Niederreiter, Arne Winterhof


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