Invariants of embeddings of 2-surfaces in 3-space

A. Skopenkov

Let $M$ be a sphere with handles and holes, $f:M\to {\mathbb{R}}^3$ an embedding, and $H_1=H_1(M;\mathbb{Z})$. We study a simple isotopy invariant of $f$, the Seifert bilinear form $L(f…