2 problems

Let $X$ and $Y$ be separable metrizable spaces with $X$ analytic, and let $\widetilde{Y}$ denote the completion used for the graph formulation. For $1<n<\omega$, let…

Let $X$ and $Y$ be separable metrizable spaces with $X$ analytic, and let $1<n\leq m<\omega$. A function $f\colon X\to Y$ is a $\Sigma_{m,n}$ function when…