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A.7.4 Messages
During a Mathematica session messages can be generated either by explicit calls to Message, or in the course of executing other built-in functions.
Message names.
If no language is specified for a particular message, text for the message is sought in each of the languages specified by $Language. If f::name is not defined, a definition for General::name is sought. If still no message is found, any value defined for $NewMessage is applied to f and "name".
Off[message] prevents a specified message from ever being printed. Check allows you to determine whether particular messages were generated during the evaluation of an expression. $MessageList and MessageList[n] record all the messages that were generated during the evaluation of a particular line in a Mathematica session.
Messages are specified as strings to be used as the first argument of StringForm. $MessagePrePrint is applied to each expression to be spliced into the string.
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