A scrapbook of complex curve theory by C. Herbert Clemens

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By C. Herbert Clemens

This wonderful booklet by means of Herb Clemens speedy turned a favourite of many algebraic geometers whilst it was once first released in 1980. it's been well-liked by newbies and specialists ever on the grounds that. it truly is written as a ebook of 'impressions' of a trip throughout the concept of advanced algebraic curves. Many themes of compelling attractiveness ensue alongside the best way. A cursory look on the topics visited finds a superbly eclectic choice, from conics and cubics to theta capabilities, Jacobians, and questions of moduli. by way of the top of the ebook, the subject matter of theta features turns into transparent, culminating within the Schottky challenge. The author's purpose was once to encourage additional research and to stimulate mathematical job. The attentive reader will study a lot approximately complicated algebraic curves and the instruments used to review them. The booklet might be specifically necessary to a person getting ready a path related to advanced curves or someone attracted to supplementing his/her analyzing

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Here are the SAGE commands which produced Fig. 9. 5 Bounds on the Parameters of a Code 21 Fig. 9 Plot of the Gilbert–Varshamov (dotted), Plotkin (dashed), and Hamming (solid) curves using SAGE The most that is “known” about the best possible lower bound is a conjecture in the binary case and is stated as follows. Conjecture 22 The binary version of the Gilbert–Varshamov bound is asymptotically exact. This folklore conjecture was known to the coding theory community since the 1960s. ” See Jiang and Vardy [JV] and Gaborit and Zemor [GZ] for recent discussions.

Also note that the shift of g4 to the right is equal to g5 = g1 + g3 + g4 ; the shift of g5 to the right is g6 = g1 + g2 + g3 ; and the shift of g6 is g7 = g2 + g3 + g4 ; the shift of g7 is g1 . Therefore, the linear code generated by G is invariant under shifts to the right. Therefore, C is a cyclic code. is_subgroup(A) True The last command tells us that the automorphism group of the code C contains the groups of cyclic permutations of order 7. This is equivalent to saying that C is cyclic. Cyclic codewords are conveniently represented as polynomials modulo x n − 1.

Then Type II, Type III, and Type IV codes are all self-dual. Furthermore, ⎧ 2[n/8] + 2 if C is Type I self-dual, ⎪ ⎪ ⎪ ⎪ ⎨ 4[n/24] + 4 if C is Type II, d≤ ⎪ 3[n/12] + 3 if C is Type III, ⎪ ⎪ ⎪ ⎩ 2[n/6] + 2 if C is Type IV. 1 in [HP1]. See also [D3] for a different approach. These upper bounds are sometimes referred to as the Mallows–Sloane bounds. 1 in [HP1], Sect. 1 in [NRS]). For a further generalization, see Sect. 2 below. A code is called optimal if its minimum distance is maximal among all linear codes of that length and dimension.

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