Results 1 to 10 of about 810 (115)

Embryonic perfect repair inspired electrospun nanofibers dressing with temperature-sensitive and antibacterial properties for wound healing [PDF]

open access: yesFrontiers in Microbiology, 2023
IntroductionThe development of highly effective wound dressings is crucial for successful clinical applications. Achieving wound closure, preventing infection, and minimizing scarring are key objectives in wound healing.
Qinbing Qi   +4 more
doaj   +2 more sources

Large Contractible Subgraphs of a 3-Connected Graph

open access: yesDiscussiones Mathematicae Graph Theory, 2021
Let m ≥ 5 be a positive integer and let G be a 3-connected graph on at least 2m + 1 vertices. We prove that G has a contractible set W such that m ≤ W ≤ 2m − 4.
Karpov Dmitri V.
doaj   +1 more source

When is the space of semi-additive functionals an absolute (neighbourhood) retract?

open access: yesPracì Mìžnarodnogo Geometričnogo Centru, 2022
In the present paper proved that if for a given compact Hausdorff space X the hyperspace exp(X) is a contractible compact space then the space OSf(X) is also a contractible compact space.
Adilbek Atakhanovich Zaitov   +1 more
doaj   +1 more source

On Fuzzy F∗-Simply Connected Spaces in Fuzzy F∗-Homotopy

open access: yesJournal of Function Spaces, 2022
In this paper, the notions of fuzzy F∗-simply connected spaces and fuzzy F∗-structure homeomorphisms are introduced, and further fuzzy F∗-structure homeomorphism between fuzzy F∗-path-connected spaces are studied.
V. Madhuri   +3 more
doaj   +1 more source

A Model of Directed Graph Cofiber

open access: yesAxioms, 2022
In the homotopy theory of spaces, the image of a continuous map is contractible to a point in its cofiber. This property does not apply when we discretize spaces and continuous maps to directed graphs and their morphisms.
Zachary McGuirk, Byungdo Park
doaj   +1 more source

Structure of edges in a 4-connected graph not contained in triangles and the number of contractible edges

open access: yesAKCE International Journal of Graphs and Combinatorics, 2018
Let G be a 4-connected graph, and let E ̃ (G) denote the set of those edges of G which are not contained in a triangle, and let E c (G) denote the set of 4-contractible edges of G . We show that if 3 ≤ | E ̃ (G) | ≤ 4 or | E ̃ (G) | ≥ 7 , then | E c (G) |
Yoshimi Egawa   +2 more
doaj   +2 more sources

An approach to Quillen’s conjecture via centralisers of simple groups

open access: yesForum of Mathematics, Sigma, 2021
For any given subgroup H of a finite group G, the Quillen poset ${\mathcal {A}}_p(G)$ of nontrivial elementary abelian p-subgroups is obtained from ${\mathcal {A}}_p(H)$ by attaching elements via their centralisers in H.
Kevin Iván Piterman
doaj   +1 more source

Fixed point sets of maps homotopic to a given map

open access: yesFixed Point Theory and Applications, 2006
Let f:X→X be a self-map of a compact, connected polyhedron and Φ⊆X a closed subset. We examine necessary and sufficient conditions for realizing Φ as the fixed point set of a map homotopic to f. For the case where Φ is a subpolyhedron,
Christina L. Soderlund
doaj   +4 more sources

Contractibility of the digital $n$-space

open access: yesApplied General Topology, 2015
The aim of this paper is to prove a known fact that the digital line is cotractible. Hence we have that the digital space $({\bf Z}^{n}, \kappa^{n})$ is also cotractible where $({\bf Z}^{n}, \kappa^{n})$ is $n$ products of the digital line $({\bf Z ...
Sayaka Hamada
doaj   +1 more source

A counter example on a Borsuk conjecture

open access: yesApplied General Topology, 2023
The  study  of  shape  restrictions  of  subsets  of Rd has  several  applications in many areas, being convexity, r-convexity, and positive reach, some of the most famous, and typically imposed in set estimation.  The following problem was attributed to
Alejandro Cholaquidis
doaj   +1 more source

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