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Thank you for your answer.

However, I obtained error when compiling. Therefore, I'm maintaining my old renewcommands of thechapter, thesection and so on and I'm trying to format only the number of the chapter title. Maybe I should use the titlesec or fancychap packages but I don't find any option ...

Thank you but... Could it be possible change only the format of the number in the title of the chapter?

Thank you again.

Hello everybody!

I'm writing a book. I'd like that in the table of contents after the chapter number appears a dot (.). I'm trying to use
\renewcommand{\thechapter}{\arabic{chapter}.}
But thus, I obtain the dot even in each chapter title.

How could I do it only in the table of contents?

Thank ...