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NumericFunction

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NumericFunction

is an attribute that indicates that a symbol is the head of a numeric function.

Mathematical functions like Sqrt have attribute NumericFunction:

• • Attributes[Sqrt]

Expressions with a head having this attribute, and with all the elements being numeric expressions, are considered numeric expressions:

• • NumericQ[Sqrt[1]]

• • NumericQ[a]=True; NumericQ[Sqrt[a]]

• • NumericQ[a]=False; NumericQ[Sqrt[a]]