Topological isotopy and the generalized Sato–Levine invariant

We will discuss topological isotopy (i.e. homotopy through topological embeddings) and links in the $3$-sphere that are not isotopic to PL links (2011.01409 and/or something newer).

Zoom (new link!): https://zoom.us/j/97302991744
Access code: the Euler characteristic of the wedge of two circles
(the password is not the specified phrase but the number that it determines)