Download e-book for iPad: Algebraic Curves over Finite Fields by Carlos Moreno

By Carlos Moreno

ISBN-10: 052134252X

ISBN-13: 9780521342520

During this tract, Professor Moreno develops the speculation of algebraic curves over finite fields, their zeta and L-functions, and, for the 1st time, the idea of algebraic geometric Goppa codes on algebraic curves. one of the functions thought of are: the matter of counting the variety of ideas of equations over finite fields; Bombieri's evidence of the Reimann speculation for functionality fields, with outcomes for the estimation of exponential sums in a single variable; Goppa's concept of error-correcting codes made out of linear structures on algebraic curves; there's additionally a brand new facts of the TsfasmanSHVladutSHZink theorem. the necessities had to persist with this publication are few, and it may be used for graduate classes for arithmetic scholars. electric engineers who have to comprehend the fashionable advancements within the idea of error-correcting codes also will reap the benefits of learning this paintings.

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We first show that dim* A/(A(D) + K) < 5(D). Suppose for a moment that there exist h > S(D) elements r t , . . , rh in A which are linearly independent modulo A(D) + K. Then for each i, 1 < i <, h, there is a divisor D- such that D < D[ and rf e A(D'j). , D'k with rf e A(D'\ 1 < i < k; but this is impossible because (A(D') + K)/(A(D) + K) is contained in A/(A (D) + K) and the latter has dimension bounded from above by d(D). 2 (ii) if D' is another divisor with Do ^ D' then /(/>') - d(D') = 1 - g.

If we set yk = YYj=i zfCjl'> w e have —d d for for i=k i =fc k. Put xk = (1 + y ^ r 1 - If iVfc, we have ^-(j^1) < 0 = D,(1), therefore i(l + yi^1) — Vtiyk1) — —d, and Vi(xk) = d. On the other hand, xk — 1 = — ^ ' ( l — ykx)~x and ffcCy^1) = d, therefore vk(xk — 1) = d. j(Wj) > ffi,-, and if fe ^ i, t>j(xtwt) = d + u,(wk) > m ; from which it follows that D,(U — W() > ffij (1 < i < /t). The theorem is thus proved if we take U; = W;. The above proof also also establishes the following corollary. 1 Let S be a finite set of distinct points on a smooth curve CK with function field K.

Show that the map S is independent of the p-variable x. 7. Show that the Carder operation and the taking of traces of differentials commute. If the residue of a differential at a point of degree one is defined as usual in terms of the coefficient of T" 1 in the formal power series expansion of the differential in powers of the local uniformizing parameter T, and for a point of arbitrary degree by taking traces from the residue class field down to the field of constants, show that the sum of the residues of a differential is 0.

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Algebraic Curves over Finite Fields by Carlos Moreno

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