This is an old revision of the document!
Please write exclusively to luciano.canepari@teletu.it. My other mailbox canepari@unive.it has been discontinued.
Unfortunately, in such complex publications as mine, misprints are hardly avoidable. Here follows a list of the most annoying ones, while others —more banal and obvious— are left for the sagacious reader to correct.
In case you detect any other misprints yourself, please point them out to the following address: canepari@teletu.it.
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