2 problems

Let $\Delta$ be a Schoenflies ball, and let $-\Delta$ denote its complementary Schoenflies ball in $S^4$. Write $\bar\Delta$ for $\Delta$ with the opposite orientation. Negative-eq…

Let $X$ be a compact Stein domain of complex dimension $2$, and let $B\subset X$ be an embedded homotopy $4$-ball bounded by a smoothly embedded $S^3$. Stein Schoenflies conjecture…