Complexes represents the domain of complex numbers, as in x \[Element] Complexes.
DirichletConvolve[f, g, n, m] gives the Dirichlet convolution of the expressions f and g.
Dispatch[{lhs_1 -> rhs_1, lhs_2 -> rhs_2, ...}] generates an optimized dispatch table representation of a list of rules. The object produced by Dispatch can be used to give ...
Enabled
(Built-in Mathematica Symbol) Enabled is an option for objects such as Slider that specifies whether the objects should be enabled for interactive manipulation.
EvenQ
(Built-in Mathematica Symbol) EvenQ[expr] gives True if expr is an even integer, and False otherwise.
FullDefinition[symbol] prints as the definitions given for symbol, and all symbols on which these depend.
Function[body] or body & is a pure function. The formal parameters are # (or #1), #2, etc. Function[x, body] is a pure function with a single formal parameter x. ...
InterpretationBox[boxes, expr] is a low-level box construct that displays as boxes but is interpreted on input as expr.
KroneckerSymbol[n, m] gives the Kronecker symbol (n/m).
LiouvilleLambda[n] gives the Liouville function \[Lambda](n).