Decide all properties for the category of Hausdorff spaces#202
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This PR decides the remaining properties Haus, the category of Hausdorff spaces. No unknown properties are left. 🎉
In particular, it is shown that
Also, the regular epimorphisms are classified. (In the previous PR #201 it was already added that Haus does not have small dense subcategory, so that Haus is not accessible. That piece of information would have better fitted here.)