‟$\mathbb H^*$” by Will Brian <wbrian.math@gmail.com>, University of North Carolina at Charlotte
Abstract:
Let $\mathbb H$ denote the half-line $[0,\infty)$, and let $\mathbb H^* = \beta \mathbb H \setminus \mathbb H$ denote its \v{C}ech-Stone remainder. We aim to discuss a recent theorem showing that the Continuum Hypothesis ($\mathsf{CH}$) implies $\mathbb H^$ is the ``generic’’ continuum of weight $\aleph_1$. What precisely this means is the main topic of the talk, but roughly it means that, in the appropriate generalized sense, $\mathsf{CH}$ implies $\mathbb H^$ is the inverse Fra"{i}ss'e limit of the class of metrizable continua. This leads directly to a topological characterization of $\mathbb H^$ under $\mathsf{CH}$: i.e., a topological property of $\mathbb H^$ such that $\mathsf{CH}$ implies $\mathbb H^*$ is, up to homeomorphism, the only weight-$\aleph_1$ continuum with this property.