KelvinKer[z] gives the Kelvin function ker(z).KelvinKer[n, z] gives the Kelvin function ker_n (z).
MoebiusMu[n] gives the Möbius function \[Mu](n).
PartitionsP[n] gives the number p (n) of unrestricted partitions of the integer n.
Sinc
(Built-in Mathematica Symbol) Sinc[z] gives sinc(z).
TrigExpand[expr] expands out trigonometric functions in expr.
TrigFactor[expr] factors trigonometric functions in expr.
Beta
(Built-in Mathematica Symbol) Beta[a, b] gives the Euler beta function \[CapitalBeta](a, b). Beta[z, a, b] gives the incomplete beta function \[CapitalBeta]_z (a, b).
In a statement like x^4+x^2>0, Mathematica treats the variable x as having a definite, though unspecified, value. Sometimes, however, it is useful to be able to make ...
HarmonicNumber[n] gives the n\[Null]^th harmonic number H_n. HarmonicNumber[n, r] gives the harmonic number H_n^(r) of order r.
LucasL
(Built-in Mathematica Symbol) LucasL[n] gives the Lucas number L_n.LucasL[n, x] gives the Lucas polynomial L_n (x).