Download Algebraic Geometry in Coding Theory and Cryptography by Harald Niederreiter PDF

By Harald Niederreiter

This textbook equips graduate scholars and complex undergraduates with the mandatory theoretical instruments for using algebraic geometry to info conception, and it covers basic functions in coding thought and cryptography. Harald Niederreiter and Chaoping Xing give you the first particular dialogue of the interaction among nonsingular projective curves and algebraic functionality fields over finite fields. This interaction is prime to analyze within the box this present day, but formerly no different textbook has featured entire proofs of it. Niederreiter and Xing conceal classical purposes like algebraic-geometry codes and elliptic-curve cryptosystems in addition to fabric no longer handled through different books, together with function-field codes, electronic nets, code-based public-key cryptosystems, and frameproof codes. Combining a scientific improvement of conception with a huge collection of real-world functions, this is often the main accomplished but obtainable creation to the sector available.Introduces graduate scholars and complicated undergraduates to the rules of algebraic geometry for functions to info idea presents the 1st distinct dialogue of the interaction among projective curves and algebraic functionality fields over finite fields contains purposes to coding thought and cryptography Covers the newest advances in algebraic-geometry codes positive aspects purposes to cryptography no longer handled in different books

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Put u = and v = d=0 u d=0 v . Without [m] loss of generality, we may assume that neither u nor v [s] is in I (otherwise we can consider u − u[m] or v − v [s] instead). By (i), u[m] v [s] = (uv)[m+s] is an element of I . Hence, u[m] ∈ I or v [s] ∈ I by the given condition. This is a contradiction. 13, we obtain the following proposition. 1. Fix the affine (respectively projective) n-space An (respectively Pn ) and consider algebraic subsets of An (respectively Pn ). The union of finitely many affine (respectively projective) algebraic sets is an affine (respectively projective) algebraic set.

5. Let n = 1. 7, the closed subsets of A1 are A1 itself and the finite subsets of A1 . 4. In fact, H0 consists only of the point [0, 1]. 4, it follows that the closed subsets of U0 are U0 itself and the finite subsets of U0 . But U0 is an open subset of P1 , and so the closed subsets of P1 are P1 itself and the finite subsets of P1 . 46 CHAPTER 2 A nonempty topological space is called irreducible if it is not equal to the union of any two proper closed subsets. 1 for basic results on irreducible spaces.

Proof. 8, the irreducible closed subsets of V correspond to prime ideals of k[X] containing I (V ). These, in turn, correspond to prime ideals of k[V ]. Hence, dim(V ) is the length of the longest chain of prime ideals of k[V ], which is the Krull dimension of k[V ] by definition. 19. For every n ≥ 1, we have dim(An ) = dim(Pn ) = n. Proof. Since I (An ) = (0), the coordinate ring k[An ] is the polynomial ring k[X] = k[x1 , . . , xn ]. 2(i) the latter Krull dimension is equal to the transcendence degree of k(X) over k, which is n.

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