JacobiCS[u, m] gives the Jacobi elliptic function cs(u | m).
JacobiNS[u, m] gives the Jacobi elliptic function ns(u | m).
JacobiZeta[\[Phi], m] gives the Jacobi zeta function Z(\[Phi] \[VerticalSeparator] m).
WaveletPhi[wave, x] gives the scaling function \[Phi](x) for the symbolic wavelet wave evaluated at x.WaveletPhi[wave] gives the scaling function as a pure function.
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Cosh
(Built-in Mathematica Symbol) Cosh[z] gives the hyperbolic cosine of z.
Gudermannian[z] gives the Gudermannian function gd(z).
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.
Rationals represents the domain of rational numbers, as in x \[Element] Rationals.