Each of the papers in this volume has been selected because the authors are `well-known', and their reputation was a significant factor in this selection process. But just because someone has done superb work in the past does not mean that they are doing so now. Indeed, the very best of us make mistakes (in our view, the only people who make no mistakes are those who do nothing at all, for fear of making mistakes). So selecting authors on the basis of reputation is not enough. Additionally, many of the underlying papers have or will have appeared elsewhere, in refereed journals. In fact, we solicited particular papers from these authors, partly to ease the burden for the authors, partly to allow us to select papers with a good potential for ``activation", and partly because the refereeing issue will be less urgent for such works: only updates or changes ought to need scrutiny (though even fatal mistakes will slip past good referees on occasion).
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