By G. David Forney Jr. (auth.), Marc Fossorier, Hideki Imai, Shu Lin, Alain Poli (eds.)

This e-book constitutes the refereed court cases of the nineteenth foreign Symposium on utilized Algebra, Algebraic Algorithms and Error-Correcting Codes, AAECC-13, held in Honolulu, Hawaii, united states in November 1999.

The forty two revised complete papers provided including six invited survey papers have been rigorously reviewed and chosen from a complete of 86 submissions. The papers are prepared in sections on codes and iterative interpreting, mathematics, graphs and matrices, block codes, jewelry and fields, deciphering equipment, code building, algebraic curves, cryptography, codes and deciphering, convolutional codes, designs, deciphering of block codes, modulation and codes, Gröbner bases and AG codes, and polynomials.

**Read Online or Download Applied Algebra, Algebraic Algorithms and Error-Correcting Codes: 13th International Symposium, AAECC-13 Honolulu, Hawaii, USA, November 15–19, 1999 Proceedings PDF**

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**Additional resources for Applied Algebra, Algebraic Algorithms and Error-Correcting Codes: 13th International Symposium, AAECC-13 Honolulu, Hawaii, USA, November 15–19, 1999 Proceedings**

**Example text**

Here, the number h of blocks equals the number of conjugacy classes of G and the projections D1 , . . , Dh form a complete set of pairwise inequivalent irreducible representations of CG. Recall that a representation of CG of degree f is an algebra morphism F : CG → Cf ×f . It is irreducible iﬀ F is surjective. Two representations F1 , F2 of degree f are equivalent, F1 ∼ F2 , if an invertible matrix X exists such that for all a ∈ CG : F1 (a) = XF2 (a)X −1 . Every isomorphism D is called a discrete Fourier transform (DFT).

T. l. the quotient of the last two quantities. 3 and the last example is concerned with a Sylow 2-subgroup of the symmetric group S16. l. t. l. 069 Of course, the ﬁrst three groups are of a very simple nature. However, the running time of the algorithm does not essentially depend on the complexity of the pc-presentation, but mainly on the number and degrees of the irreducible representations constituting the DFT. This is veriﬁed by the more complex example Syl2 (S16 ). Therefore, the actual running times for constructing a monomial DFT of CG reﬂect very well the theoretical result concerning the output length.

If Xk := Xiπk−1 F · . . · XiF , 0 ≤ k < p, then i ⎡ Z ⎢ X1 X0−1 ⎢ ⎢ X2 X1−1 D(gi ) = ⎢ ⎢ .. ⎣ . ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ −1 Xp−1 Xp−2 −1 , as shown in [3]. where Z := X0 F (gip )Xp−1 By these two constructions, all irreducible representations of Gi up to isomorphism are obtained, and Phase 1 is complete. In addition, during the construction in Phase 1 a bipartite graph is built up in which F ∈ F and D ∈ D are linked if and only if F is a constituent of D ↓ Gi−1 . This “traceback” information is needed in the next phase.