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In chapter 4, corallary 4.6.4, we found this:

\begin{cor}
  For any $f:A\to B$ we have
  \[ \isequiv(f) \eqvsym (\mathsf{isEmbedding}(f) \times \mathsf{isSurjective}(f)).\]
\end{cor}

Despite we may infer from the reading the respective types, they must be explicit as all other
terms in the book.

Waiting for:

https://tex.stackexchange.com/q/430543/15256