2 problems

Let $C^2(\alpha9\omega)$ denote the inner model obtained from second-order definability over $\alpha9\omega$, let $\text{CH}$ denote the continuum hypothesis, and let $M_n$ denote th…

Let $X$ be a locally compact, non-compact, separable metrizable space, and let $X^*$ denote its Stone–Čech remainder. An autohomeomorphism of $X^*$ is a homeomorphism from $X^*$ to…