Publicacions matemàtiques - Dipòsit Digital de Documents de la UAB

Publicacions matemàtiques

Publicacions Matemàtiques (ISSN: 0214-1493 imprès, 2014-4350 en línia) és una revista que publica articles de qualitat de recerca de tots els camps de les matemàtiques i, de tant en quant, també actes de congressos. Aquesta revista va començar l'any 1976 amb el títol de Publicacions de la Secció de Matemàtiques (ISSN: 0210-2978 imprès, 2014-4369 en línia). L'any 1988 va introduir un nou format i comitè editorial que van donar lloc a la segona etapa d'aquesta revista.

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2013-01-10
15:40

19 p, 202.1 KB

Convexity of strata in diagonal pants graphs of surfaces / Aramayona, J. ; Lecuire, C. ; Parlier, H. ; Shackleton, K. J.
We prove a number of convexity results for strata of the diagonal pants graph of a surface, in analogy with the extrinsic geometric properties of strata in the Weil-Petersson completion. As a consequence, we exhibit convex flat subgraphs of every possible rank inside the diagonal pants graph.
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 219-237

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2013-01-10
15:33

63 p, 650.6 KB

Flux limited generalized porous media diffusion equations / Caselles, V.
We study a class of generalized porous media type flux limited diffusion equations and we prove the existence and uniqueness of entropy solutions. We compute the Rankine-Hugoniot condition on the jump set for solutions which are of locally bounded variation in space and time. [...]
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 155-217

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2013-01-10
15:25

15 p, 315.9 KB

On the fixed-point set of an automorphism of a group / Wehrfritz, B. A. F.
Let Ø be an automorphism of a group G. Under variousfiniteness or solubility hypotheses, for example under polycyclicity, the commutator subgroup [G; Ø] has finite index in G if thefixed-point set CG(Ø) of Ø in G isfinite, but not conversely, even for polycyclic groups G. [...]
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 139-153

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2013-01-10
15:02

15 p, 445.0 KB

Degree of the first integral of a pencil in defined by Lins Neto / Puchuri Medina, Liliana
Let P4 be the linear family of foliations of degree 4 in P2 introduced by A. Lins Neto, whose set of parameter withfirst integral Ip(P4) is dense and countable. In this work, we will compute explicitly the degree of the rationalfirst integral of the foliations in this linear family, as a function of the parameter.
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 123-137

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2013-01-10
14:59

16 p, 349.9 KB

On rings whose modules have nonzero homomorphisms to nonzero submodules / Tolooei, Y. ; Vedadi, M. R.
We carry out a study of rings R for which HomR (M;N) 6= 0 for all nonzero N ≤ MR. Such rings are called retractable. For a retractable ring, Artinian condition and having Krull dimension are equivalent. [...]
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 107-122

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2013-01-10
14:46

26 p, 437.5 KB

A new characterization of Triebel-Lizorkin spaces on R2 / Yang, Dachung. ; Yuan, Wen. ; Zhou, Yuan
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 57-82

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2013-01-10
14:38

54 p, 537.9 KB

Two-weight norm inequalities for potential type and maximal operators in a metric space / Kairema, Anna
We characterize two-weight norm inequalities for potential type integral operators in terms of Sawyer-type testing conditions. Our result is stated in a space of homogeneous type with no additional geometric assumptions, such as group structure or non-empty annulus property, which appeared in earlier works on the subject. [...]
2013
Publicacions matemàtiques, Vol. 57, Núm. 1 (2013) , p. 3-56

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2012-06-14
20:15

5 p, 248.3 KB

On non-commuting sets in finite soluble CC-groups / Ballester-Bolinches, A. ; Cossey, J.
Lower bounds for the number of elements of the largest non-commuting set of a finite soluble group with a CC subgroup are considered in this paper.
2012
Publicacions matemàtiques, Vol. 56, Núm. 2 (2012) , p. 0467-471

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2012-06-14
20:10

17 p, 366.9 KB

On the power pseudovariety / Auinger, K.
The pseudovariety PCS which is generated by all power semigroups of finite completely simple semigroups is characterized in various ways. For example, the equalities PCS = Jm CS = BGm RB are established. [...]
2012
Publicacions matemàtiques, Vol. 56, Núm. 2 (2012) , p. 449-465

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2012-06-14
20:05

36 p, 441.5 KB

A degree problem for two algebraic numbers and their sum / Drungilas, P. ; Dubickas, A. ; Smyth, C.
For all but one positive integer triplet (a; b; c) with a < b < c and b < 6, we decide whether there are algebraic numbers α,β and γ of degrees a, b and y, respectively, such that α+β+γ = 0. [...]
2012
Publicacions matemàtiques, Vol. 56, Núm. 2 (2012) , p. 413-448

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