Ciencias,UNAM

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Browsing Matemáticas by Title

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  • ON THE LATTICE R-TORS FOR SEMIPERFECT AND QF RINGS
    RINCONMEJIA, HA (1991)
    We define the equivalence relation approximately F in R-tors by tau approximately F-sigma iff the class of tau-codivisible modules coincides with the class of sigma-codivisible modules. We define the equivalence relation ...
  • On the lattices of natural and conatural classes in R-mod
    Rincon, H; Montes, JR; García, AA (2001)
  • On the Omega - EP property
    Mendez-Lango, H (2007)
    A continuum X has the Omega - EP property provided that for each self-mapping f the set of nonwandering points of f is contained in the closure of the set of eventually periodic points of f. It is known that the interval ...
  • On the ontogeny of the motor circadian rhythm in crayfish
    Fuentes-Pardo, B; Lara-Aparicio, M; De Medrano, SL (2001)
    In this paper we attack the problem of understanding the localization of the main structures involved in the motor circadian rhythm of crayfish by analysing its ontogeny. We present experimental results giving the properties ...
  • On the Relative Socle for Stratifying Systems
    Lanzilotta, M; Marcos, E; Mendoza, O; Saenz, C (2010)
    Let A be a finite dimensional k-algebra, (, ) be a stratifying system in mod(A) and F() be the class of -filtered A-modules. In this article, we give the definition and also study some of the properties of the relative ...
  • Open mappings increasing order
    Charatonik, JJ; Charatonik, WJ (1997)
    It is shown that an analog of Whyburn's theorem saying that open mappings do not increase order of a point of locally compact metric spaces is not true if the Menger-Urysohn order is replaced by order in the classical ...
  • Openness and monotoneity of induced mappings
    Charatonik, WJ (1999)
    It is shown that for locally connected continuum X if the induced mapping C(f) : C(X) --> C(Y) is open,then f is monotone. As a corollary it follows that if the continuum X is hereditarily locally connected and C(f) is ...
  • Openness of induced projections
    Charatonik, JJ; Charatonik, WJ; Illanes, A (2000)
    For continua X and Y it is shown that if the projection f : X x Y --> X has its induced mapping C(f) open, then X is C-smooth. As a corollary, a characterization of dendrites in these terms is obtained.
  • An optimal investment strategy with maximal risk aversion and its ruin probability
    Fernandez, Begona; Hernandez-Hernandez, Daniel; Meda-Guardiola, Ana; et. al. (Mathematical Methods of Operations Research, 2008-08)
    Abstract Let W = (W(i))(i is an element of N) he an infinite dimensional Brownian motion and (X(t))(1 >= 0) a continuous adapted n-dimensional process. Set tau(R) = infit : X(t) - x(t)vertical bar, where x(t-t) >= 0 is ...
  • Orbit spaces and unions of equivariant absolute neighborhood extensors
    Antonyan, SA (2005)
    Let G be a locally compact Hausdorff group. We study orbit spaces and unions of equivariant absolute neighborhood extensors (G-ANEs) in the category of all proper G-spaces that are metrizable by a G-invariant metric. We ...
  • Orbit spaces and unions of equivariant absolute neighborhood extensors (vol 146, pg 289, 2005)
    Antonyan, SA (2006)
  • Orbit spaces of proper equivariant absolute extensors
    Antonyan, SA (2005)
    Let G be a locally compact Hausdorff group. We study orbit spaces of equivariant absolute neighborhood extensors (G-ANE's) in the category of all proper G-spaces that are metrizable by a G-invariant metric. We prove that ...
  • The origins of set theory, 1854-1908
    Garcíadiego, AR (1998)
  • P-FRECHET-URYSOHN PROPERTY OF FUNCTION-SPACES
    GarcíaFERREIRA, S; Tamariz, A (1994)
    In this paper, we study the p-Frechet-Urysohn property of function spaces, for p is-an-element-of beta(omega)\omega. We prove that C(pi)(X) is p-Frechet-Urysohn if and only if X has (gamma(p)), where (gamma(p) is the natural ...
  • p-pseudocompactness and related topics in topological spaces
    Sanchis, M; Tamariz, A (1999)
    We prove some basic properties of p-bounded subsets (p epsilon omega) in terms of z-ultrafilters and families of continuous functions, We analyze the relations between p-pseudocompactness with other pseudocompact like-properties ...
  • A parameter in the learning rule of SOM that incorporates activation frequency
    Neme, A; Miramontes, P (2006)
    In the traditional self-organizing map (SOM) the best matching unit (BMU) affects other neurons, through the learning rule, as a function of distance. Here, we propose a new parameter in the learning rule so neurons are ...
  • Partial linear spaces with dual affine planes
    Cardenas, H; Lluis, E; Raggi-Cardenas, AG; San Agustin, R (2002)
  • Pattern-based data compression
    Kuri, A; Galaviz, J (2004)
    Most modern lossless data compression techniques used today, are based in dictionaries. If some string of data being compressed matches a portion previously seen, then such string is included in the dictionary and its ...
  • Poincare series and instability of exponential maps
    Makienko, P; Sienra , G (2006)
    We relate the properties of the postsingular set for the exponential family regarding stability questions. We calculate the action of the Ruelle operator for the exponential family, and we prove that if the asymptotic (or ...
  • Principal configurations and umbilicity of submanifolds in R-N
    Moraes, SM; Romero-Fuster, MC; Sánchez-Bringas, F (2004)
    We consider the principal configurations associated to smooth vector fields nu normal to a manifold M immersed into a euclidean space and give conditions on the number of principal directions shared by a set of k normal ...

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