HoldFirst is an attribute which specifies that the first argument to a function is to be maintained in an unevaluated form.
InverseZTransform[expr, z, n] gives the inverse Z transform of expr. InverseZTransform[expr, {z_1, z_2, ...}, {n_1, n_2, ...}] gives the multiple inverse Z transform of expr.
JacobiCN[u, m] gives the Jacobi elliptic function cn(u | m).
LibraryFunction[args] represents a function that has been loaded from a Wolfram Library.
Limit
(Built-in Mathematica Symbol) Limit[expr, x -> x_0] finds the limiting value of expr when x approaches x_0.
MachineNumberQ[expr] returns True if expr is a machine-precision real or complex number, and returns False otherwise.
MaxDetect[image] gives a binary image in which white pixels correspond to constant extended maxima in image.MaxDetect[image, h] finds extended maxima where the range of ...
PrimeZetaP[s] gives prime zeta function P(s).
SpheroidalS2[n, m, \[Gamma], z] gives the radial spheroidal function S_n^m, (2)(\[Gamma], z) of the second kind.
Thinning[image] finds the skeletons of foreground regions in image by applying morphological thinning until convergence.Thinning[image, n] performs n iterations of ...