RealExponent (Built-in Mathematica Symbol)

RealExponent[x] gives log_10 (|x|).RealExponent[x, b] gives log_b (|x|).

RiemannSiegelTheta (Built-in Mathematica Symbol)

RiemannSiegelTheta[t] gives the Riemann\[Dash]Siegel function \[CurlyTheta](t).

RiemannSiegelZ (Built-in Mathematica Symbol)

RiemannSiegelZ[t] gives the Riemann\[Dash]Siegel function Z(t).

SinhIntegral (Built-in Mathematica Symbol)

SinhIntegral[z] gives the hyperbolic sine integral function Shi(z).

Sqrt (Built-in Mathematica Symbol)

Sqrt[z] or Sqrt[z] gives the square root of z.

StieltjesGamma (Built-in Mathematica Symbol)

StieltjesGamma[n] gives the Stieltjes constant \[Gamma]_n. StieltjesGamma[n, a] gives the generalized Stieltjes constant \[Gamma]_n (a).

StirlingS2 (Built-in Mathematica Symbol)

StirlingS2[n, m] gives the Stirling number of the second kind \[ScriptCapitalS]_n^(m).

TrigReduce (Built-in Mathematica Symbol)

TrigReduce[expr] rewrites products and powers of trigonometric functions in expr in terms of trigonometric functions with combined arguments.

WhittakerM (Built-in Mathematica Symbol)

WhittakerM[k, m, z] gives the Whittaker function M k, m (z).

MathLink and External Program ... (Mathematica Overview)

Introduction to MathLink How MathLink Is Used Installing Existing MathLink-Compatible Programs