ExactNumberQ[expr] returns True if expr is an exact real or complex number, and returns False otherwise.
FourierParameters is an option to Fourier and related functions that specifies the conventions to use in computing Fourier transforms.
PackingMethod is an option for GraphPlot and related functions which specifies how disconnected components should be packed together in the layout produced.
RamanujanTauL[s] gives the Ramanujan tau Dirichlet L-function L(s).
In many kinds of calculations, you need to set up "arrays" that contain sequences of expressions, each specified by a certain index. One way to implement arrays in ...
RiemannSiegelTheta[t] gives the Riemann\[Dash]Siegel function \[CurlyTheta](t).
KroneckerProduct[m_1, m_2, ...] constructs the Kronecker product of the arrays m_i.
CDFWavelet[] represents a Cohen\[Dash]Daubechies\[Dash]Feauveau wavelet of type "9/7". CDFWavelet["type"] represents a Cohen\[Dash]Daubechies\[Dash]Feauveau wavelet of type " ...
Arg
(Built-in Mathematica Symbol) Arg[z] gives the argument of the complex number z.
WaitAll
(Built-in Mathematica Symbol) WaitAll[expr] waits for all concurrent evaluations represented by EvaluationObject expressions in expr to finish, then returns the resulting expression obtained.