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Continuum Theory

Andrea Ammerlaan

Subevent of Continuum Theory - Thurs. PM

Forbes 2070A

Eastern Time (US & Canada)

Starts at: 2025-03-06 03:35PM

Ends at: 2025-03-06 03:55PM

Planarity of compactifications of R with arc-like remainder

Andrea Ammerlaan ⟨ajammerlaan879@my.nipissingu.ca⟩

Abstract:

In 1972, Nadler and Quinn asked if for any arc-like continuum $X$, and point $x \in X$, there exists a plane embedding of $X$ in which $x$ is accessible. A continuum $X$ is arc-like if it can be expressed as an inverse limit on arcs and, if $X$ is in the plane $\mathbb{R}^2$, a point $x \in X$ is called accessible if there exists an arc $A \subset \mathbb{R}^2$ such that $A \cap X =$ {$x$}. The question was recently answered in the positive (AA, Anušić, Hoehn 2024). This talk will discuss some consequences of the result: if $X$ is an arc-like continuum, then any continuum which is the disjoint union of $X$ and a ray $R$, with cl$(R) \setminus R \subseteq X$, is embeddedable in the plane, as is any compactification of a line having remainder $X$.

Joint work with Logan Hoehn.

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