Results 61 to 70 of about 239 (123)

The polyploid continuum and the landscape of polyploid genomic variation

American Journal of Botany, Volume 112, Issue 11, November 2025.
Abstract Polyploid research has traditionally distinguished between autopolyploids and allopolyploids on the basis of evolutionary origins, modes of inheritance, or chromosomal pairing behavior during meiosis. It has long been recognized, however, that a binary classification does not accurately reflect the complexity and diversity inherent to ...
Alex D. Twyford, Justin L. Conover, Jeff J. Doyle, Annaliese S. Mason, Douglas E. Soltis, Pamela S. Soltis, Jonathan F. Wendel   +6 more
wiley   +1 more source

Arc-Smooth Continua

, 1981
Continua admitting arc-structures and arc-smooth continua are introduced as higher dimensional analogues of dendroids and smooth dendroids, respectively.
Fugate, J. B., Lum, Lewis, Gordh, G. R., Jr.   +2 more
core   +2 more sources

A characterization of inducible mappings between hyperspaces

, 2022
"For fixed hyperspaces H(X) and H(Y ) of metric continua X and Y , respectively, a mapping g : H(X) → H(Y ) is called inducible provided that there exists a mapping f : X → Y such that g(A) = {f(a) : a ∈ A}, for every A ∈ H(X). In this paper, we present
Maya, David, Orozco-Zitl, Fernando, G. Anay, José   +2 more
core  

Continua whose hyperspace and suspension are homeomorphic

General Topology and its Applications, 1978
AbstractLet X be a (nonempty metric) continuum. By the hyperspace of X we mean C(X)={A:A is a nonempty subcontinuum of X} with the Hausdorff metric. The suspension S(X) of X is the quotient space (X×[-1, +1])R, where X×[-1, +1] is the cartesian product of X and the closed interval [-1, +1] and R is the equivalence relation given by: (x1, t1)R(x2, t2 ...
Nadler, Sam B., Quinn, J.
openaire   +2 more sources

The hyperspaces C(p,X) for atriodic continua

, 2005
Let C(X) denote the hyperspace of subcontinua of a continuum X. For A is an element of C(X), define the hyperspace C(A, X) = {B is an element of C(X) : A subset of B}.
Pellicer-Covarrubias, P
core  

Nonblockers in hyperspaces

, 2012
Using nonblockers in hyperspaces (Illanes and Krupski (2011) [3]), we characterize some classes of locally connected continua: the simple closed curve, the arc, trees, and dendrites.
Escobedo, Raúl, Villanueva, Hugo, de Jesús López, María   +2 more
core   +1 more source

Weakly confluent mappings and the covering property of hyperspaces

, 1979
In this note we characterize the continua which are images of weakly confluent mappings only in terms of a covering property for hyperspaces and in terms on an embedding property. This answers some questions of B. Hughes and A. Lelek.
E. D. Tymchatyn, J. Grispolakis
core   +1 more source

On continua whose hyperspace of subcontinua is σ-locally connected

Topology and its Applications, 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Krzemińska, Iwona, Prajs, Janusz R.
openaire   +1 more source

Induced maps on n-fold hyperspaces

, 2007
For a given map between continua we study the induced maps between n-fold hyperspaces and between n-fold hyperspace suspensions. Our results on n-fold hyperspaces extend some results that are known for the induced maps between the hyperspace of ...
López, MDJ, Macias, S
core  

A note regarding “contractibility”, “contractibility with respect to” and “contractibility in”

Revista Integración
In this article, we present a comparative study of the concepts of contractibility, contractibility with respect to, and contractibility in, applied in topological spaces and in hyperspaces of continua.
Félix Capulín, David Maya, A. Cecilia Sierra-Cuevas   +2 more
doaj