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Is there a summary for all Function like
NumberQ, LetterQ and so forth?


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marked as duplicate by R. M. Mar 7 '13 at 14:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Do you mean a list of functions ending in Q?



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(+1) or ?*`*Q to get all 1243 functions. – kglr Mar 7 '13 at 13:55
There is an example like this in the documentation page on Information. Typing "?" in help is useless :( (it does not bring you to Information). Also the syntax is so special that you cannot do something like Hold[?*Q]//FullForm to find out what function is being used. So I figured I'd post this. – Jacob Akkerboom Mar 7 '13 at 14:11
Of course, not all of these are querying functions. EllipticNomeQ[], LegendreQ[], and MarcumQ[] are examples that spring to mind. – J. M. Apr 16 '13 at 13:24

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