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>It's not that such systems will return wrong answers - it's that there are >right answers they cannot find. How that would echo through a system or >whether users would even notice the missing information isn't clear. There are reasonable techniques for handling such circumstances - e.g. timing out ;-) I can't remember where but it has been said more than once that the web will never be perfect, if you allow this then the problems don't arise. I wonder if the thing you describe could also be expressed as a kind of halting problem???>
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