Get Higher-Dimensional Geometry Over Finite Fields PDF

By Y. Tschinkel, Y. Tschinkel

ISBN-10: 1586038559

ISBN-13: 9781586038557

Quantity platforms in keeping with a finite number of symbols, corresponding to the 0s and 1s of laptop circuitry, are ubiquitous within the glossy age. Finite fields are an important such quantity structures, enjoying an important function in army and civilian communications via coding idea and cryptography. those disciplines have developed over fresh many years, and the place as soon as the focal point used to be on algebraic curves over finite fields, fresh advancements have printed the expanding significance of higher-dimensional algebraic forms over finite fields.

The papers incorporated during this booklet introduce the reader to fresh advancements in algebraic geometry over finite fields with specific consciousness to purposes of geometric strategies to the examine of rational issues on types over finite fields of size of at the very least 2.

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Additional resources for Higher-Dimensional Geometry Over Finite Fields

Example text

C. Graf v. Bothmer / Finite Field Experiments 39 Figure 18. A Kummer surface with 16 nodes. 2. We look at 100 random surfaces that are symmetric with respect to the x = 0 plane -- make a random f mirror symmetric sym = (f) -> f+sub(f,{x=>-x}) time tally apply(100, i-> mu(sym(random(7,R)))) o6 = Tally{0 => 57} 1 => 10 2 => 11 3 => 9 4 => 4 5 => 3 6 => 3 7 => 1 9 => 1 13 => 1 Indeed, we obtain more singularities, but not nearly enough. The symmetry approach works best if we have a large symmetry group.

Fm ) ⊂ AnZ has a unique solution over Q, In this case it follows that the solution is defined over Q. ¯ possibly with high multiplicity Figure 15. 1. If the coordinates of the unique solution over Q are even in Z one can find this solution as follows: (i) (ii) (iii) (iv) points in Fnpi Reduce mod pi and test Find many primes pi with a unique solution in Fnpi Use Chinese remaindering to find a solution mod i pi 0. Test if this is a solution over Z. If not, find more primes pi with unique solutions over Fpi .

Det modn(sub(J,P),7)) )) o25 = {(| 2 3 |, true), (| 5 5 |, true)} Both points are isolated and smooth over F7 so we can apply p-adic Newton iteration to them. 11. Noam Elkies has used this method to find interesting elliptic fibrations over Q. See for example [3, Section III, p. 11]. 12. The Newton method is much faster than lifting by Chinese remaindering, since we only need to find one smooth point in one characteristic. Unfortunately, it does not work if we cannot calculate tangent spaces. An application where this happens is discussed in the next section.

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Higher-Dimensional Geometry Over Finite Fields by Y. Tschinkel, Y. Tschinkel

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