  The main subjects of this text are:
  (1) Generalization of concepts and operations, like distance and size, to
situations where they are not definable in the usual way.
  (2) A pragmatic theory of handling contradictions using reliability of the
information sources.
  (3) Relation of formal semantics to brain processes.
  (4) Remarks on Yablo's coding of the liar paradox in infinite acyclic graphs.
