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Articles 19 registres trobats  anterior11 - 19  anar al registre: La cerca s'ha fet en 0.00 segons. 
11.
9 p, 1.5 MB On primitive constant dimension codes and a geometrical sunflower bound / Barrolleta, Roland David (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Storme, Leo (Universiteit Gent. Department of Mathematics) ; Suárez Canedo, E. (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Vandendriessche, Peter (Universiteit Gent. Department of Mathematics)
In this paper we study subspace codes with constant intersection dimension (SCIDs). We investigate the largest possible dimension spanned by such a code that can yield non-sunflower codes, and classify the examples attaining equality in that bound as one of two infinite families. [...]
2017 - 10.3934/amc.2017055
Advances in mathematics of communications, Vol. 11, issue 4 (2017) , p. 757-765  
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12.
22 p, 1.2 MB Kernels and ranks of cyclic and negacyclic quaternary codes / Dougherty, Steven T. (University of Scranton. Department of Mathematics) ; Fernández Córdoba, Cristina (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions)
We study the rank and kernel of Z4 cyclic codes of odd length n and give bounds on the size of the kernel and the rank. Given that a cyclic code of odd length is of the form C = <fh, 2fg> , where fgh = x^n − 1, we show that <2f> ⊆ K(C) ⊆ C and C ⊆ R(C) ⊆ <fh, 2g> where K(C) is the preimage of the binary kernel and R(C) is the preimage of the space generated by the image of C. [...]
2016 - 10.1007/s10623-015-0163-6
Designs, codes and cryptography, Vol. 81, Issue 2 (Nov. 2016) , p. 347-364  
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13.
6 p, 1.4 MB About some Hadamard full propelinear (2t,2,2)-codes : Rank and Kernel / Bailera, Ivan (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Borges, J. (Joaquim) (Joaquim) (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Rifà i Coma, Josep (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions)
A new subclass of Hadamard full propelinear codes is introduced in this article. We define the HFP(2t,2,2)-codes as codes with a group structure isomorphic to C₂t × C₂^2. Concepts such as rank and dimension of the kernel are studied, and bounds for them are established. [...]
2016 - 10.1016/j.endm.2016.09.055
Electronic notes in discrete mathematics, Vol. 54 (Oct. 2016) , p. 319-324  
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14.
8 p, 1010.8 KB Ranks and kernels of codes from generalized Hadamard matrices / Dougherty, Steven T. (University of Scranton. Department of Mathematics) ; Rifà i Coma, Josep (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions) ; Villanueva, M. (Mercè) (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions)
The ranks and kernels of generalized Hadamard matrices are studied. It is proved that any generalized Hadamard matrix H(q, λ) over Fq , q > 3, or q = 3 and gcd(3, λ) ≠ 1, generates a self-orthogonal code. [...]
2016 - 10.1109/TIT.2015.2509061
IEEE transactions on information theory, Vol. 62 No. 2 (Feb. 2016) , p. 687-694  
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15.
19 p, 1.9 MB Construction of Hadamard Z₂Z₄Q₈-codes for each allowable value of the rank and dimension of the kernel / Montolio, Pere (Universitat Oberta de Catalunya) ; Rifà i Coma, Josep (Universitat Autònoma de Barcelona. Departament d'Enginyeria de la Informació i de les Comunicacions)
This work deals with Hadamard Z₂Z₄Q₈-codes, which are binary codes after a Gray map from a subgroup of a direct product of Z₂, Z₄ and Q₈ groups, where Q₈ is the quaternionic group. In a previous work, these kind of codes were classified in five shapes. [...]
2015 - 10.1109/TIT.2015.2398869
IEEE transactions on information theory, Vol. 61 Issue 4 (April 2015) , p. 1948-1958  
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16.
10 p, 278.3 KB Groups with normality conditions for subgroups of infinite rank / De Falco, Maria (Università di Napoli Federico II. Dipartimento di Matematica e Applicazioni) ; de Giovanni, Francesco (Università di Napoli Federico II. Dipartimento di Matematica e Applicazioni) ; Musella, Carmela (Università di Napoli Federico II. Dipartimento di Matematica e Applicazioni)
A well-known theorem of B. H. Neumann states that a group has finite conjugacy classes of subgroups if and only if it is central-by-finite. It is proved here that if G is a generalized radical group of infinite rank in which the conjugacy classes of subgroups of infinite rank are finite, then every subgroup of G has finitely many conjugates, and so G=Z(G) is finite. [...]
2014 - 10.5565/PUBLMAT_58214_16
Publicacions matemàtiques, Vol. 58, Núm. 2 (2014) , p. 331-340  
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17.
10 p, 135.8 KB Corrigenda : "stabilization in H∞R(D)" / Wick, Brett D. (Georgia Institute of Technology. School of Mathematics)
In this corrigenda we outline the necessary changes to the paper [3] so that the main result in that paper is made correct. The mistake the author made in the previous version was that the condition that f1 being positive on the zeros of f2 was not strong enough ∞ to guarantee the existence of the logarithm in HR (D).
2011 - 10.5565/PUBLMAT_55111_11
Publicacions matemàtiques, Vol. 55, Núm. 1 (2011) , p. 251-260  
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18.
28 p, 271.0 KB Stabilization in Hr ∞ (D) / Wick, Brett D. (University of South Carolina. Department of Mathematics)
It is shown that for H∞/R(D)functions f1 and f2 with inf/z ∈D (│f1(z)│+ │f2(z) │≥ ᵟ > 0 and f1 being positive on the real zeros of f2, then there exists H∞/R (D) functions g2 and g1, g1 -1 with norm controlled by a constant depending only on ᵟ g1f1 + g2f2 = 1 ∀ z ∈ D. [...]
2010 - 10.5565/PUBLMAT_54110_02
Publicacions matemàtiques, V. 54 n. 1 (2010) p. 25-52  
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19.
11 p, 136.6 KB A Note on the continuous extensions of injective morphisms between free groups to relatively free profinite groups / Coulbois, Thierry ; Sapir, Mark V ; Weil, Pascal
Let V be a pseudovariety of finite groups such that free groups are residually V, and let ϕ: F(A) → F(B) be an injective morphism between finitely generated free groups. We characterize the situations where the continuous extension ˆϕ of ϕ between the pro-V completions of F(A) and F(B) is also injective. [...]
2003 - 10.5565/PUBLMAT_47203_10
Publicacions matemàtiques, V. 47 N. 2 (2003) , p. 477-487  
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