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Questions about Mathematica's predicate functions.

Questions about Mathematica's predicate functions, usually ending with Q (indicating "question"). These functions test the input expression whether it fits the condition defined by the predicate function. These functions can test numerical properties (Negative, Positive, OddQ, etc.), equality/identity/relation (Equal, SameQ, LessEqual, etc.), data types (NumericQ, IntegerQ, StringQ, SymbolQ, etc.), and general expressions (TrueQ, AtomQ, etc.).

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