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Devonian and Carboniferous dendroid graptolites from Belgium and their significance for the taxonomy of the Dendroidea [PDF]
Geobios, 2020 International audienceDevonian and Carboniferous dendroid graptolites from Belgium are evaluated and partly revised. New finds in two different stratigraphic intervals of the ‘Carrière de Lompret’, an active quarry exploiting Frasnian limestones and ...
Jörg Maletz +2 more
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Fundamenta Mathematicae, 2006 A bottleneck in a dendroid is a continuum that intersects every arc con- necting two non-empty open sets. Piotr Minc proved that every dendroid contains a point, which we call a center, contained in arbitrarily small bottlenecks. We study the effect that the set of centers in a dendroid has on its structure.
Jo Heath, Van C. Nall
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Embedding Smooth Dendroids in Hyperspaces
Canadian Journal of Mathematics, 1979A continuum will be a connected, compact, metric space. By a mapping we mean a continuous function. By a partially ordered space X we mean a continuum X together with a partial order which is closed when regarded as a subset of X × X. We let 2x (resp. C(X)) denote the hyperspace of closed subsets (resp.
Grispolakis, J., Tymchatyn, E. D.
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A CONCEPT OF POINTWISE SMOOTH DENDROIDS
Russian Mathematical Surveys, 1979n-* °° xn with lim xn=x. The point p(x) is called an initial point for χ in X. n-* It is easy to see that every smooth dendroid is also pointwise smooth. PROPOSITION 1. If a dendroid X is pointwise smooth, then so is every subdendroid ofX (the heredity of pointwise smoothness for dendroids). PROOF. Let Y be a subdendroid of X and χ E Y.
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Proceedings of the Romanian Academy, Series A: Mathematics, Physics, Technical Sciences, Information Science
Let $X$ be a continuum. A mean is a continuous function $m:X\times X\to X$ such that $m(x,x)=x$ and $m(x,y)=m(y,x)$ for every $x,y\in X$. In this note we give an example to respond negatively a question that appears in [3] and observe that using a theorem that appears in [1], two other questions posed in [3] are answered.
Enrique CASTAÑEDA-ALVARADO +1 more
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Let $X$ be a continuum. A mean is a continuous function $m:X\times X\to X$ such that $m(x,x)=x$ and $m(x,y)=m(y,x)$ for every $x,y\in X$. In this note we give an example to respond negatively a question that appears in [3] and observe that using a theorem that appears in [1], two other questions posed in [3] are answered.
Enrique CASTAÑEDA-ALVARADO +1 more
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The Structure of the Dendroid Graptolites
Geological Magazine, 1942In 1938 Roman Kozlowski published a preliminary account of a collection of dendroid graptolites and allied forms from the Upper Tremadoc of Wysoczki, Poland, upon which he had been working for many years. All of the thirty-eight species listed were new to science, as were twelve of the seventeen genera, for the reception of which he erected three new ...
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