I am sure I am missing something obvious here, but I cannot resolve the following (presumably apparent) contradiction. In the book "Topological manifold" by John Lee, 2nd edition, proposition 4.93, some sufficient conditions for a map to be proper are stated. Condition (e) is
Let $F:X\rightarrow Y$ be a continuous map, $Y$ a Hausdorff space. If $F$ has a continuous left inverse than $F$ is proper.
It seems to me that since $F$ is continuous with left continuous inverse it is a topological embedding. But then wouldn't the example mentioned here
Embeddings are precisely proper injective immersions.
of the embedding of an open disk (with subspace topology) in $\mathbb{R}^2$ be a counterexample as the inclusion is not proper? (e.g. the inverse image of the closed disk is the open disk).
In fact condition (d) of proposition 4.93 says that closed embeddings are proper.