2 Matching Annotations
  1. Dec 2018
    1. Therefore we advise the beginner to skip from here, go directly to§3, and return to this section only when the need arises.

      They've buried the lede here apparently.

    2. completions of partially orderedsets and of metric spaces,ˇCech-Stone compactifications of topological spaces, sym-metrizations of relations, abelianizations of groups, Bohr compactifications of topo-logical groups, minimalizations of reachable acceptors, etc.

      The tough part of category theory is lists of things like this right up front which will tend to scare off almost any reader but those who are working on Ph.D.s in mathematics...