Clopen and Connected sets #840
Merged
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Motivation for this change
PR #797 has stuff about clopen sets, disconnectedness, and 2nd countability. This PR is splitting things up for an easier review, and I'll close the other. This one defines the basics of clopen sets a bit about connectedness.
Things done/to do
CHANGELOG_UNRELEASED.md(do not edit former entries, only append new ones, be careful:
merge and rebase have a tendency to mess up
CHANGELOG_UNRELEASED.md)Automatic note to reviewers
Read this Checklist and put a milestone if possible.