BesselI (Built-in Mathematica Symbol)

BesselI[n, z] gives the modified Bessel function of the first kind I_n (z).

BesselK (Built-in Mathematica Symbol)

BesselK[n, z] gives the modified Bessel function of the second kind K_n (z).

BesselY (Built-in Mathematica Symbol)

BesselY[n, z] gives the Bessel function of the second kind Y_n (z).

ChebyshevT (Built-in Mathematica Symbol)

ChebyshevT[n, x] gives the Chebyshev polynomial of the first kind T_n (x).

Hypergeometric2F1Regularized (Built-in Mathematica Symbol)

Hypergeometric2F1Regularized[a, b, c, z] is the regularized hypergeometric function \[Null]_2 F_1 (a, b; c; z)/\[CapitalGamma](c).

OutputAutoOverwrite (Built-in Mathematica Symbol)

OutputAutoOverwrite is an option for notebooks that specifies whether the output of a command should replace any existing output from a previous evaluation.

ReturnExpressionPacket (Built-in Mathematica Symbol)

ReturnExpressionPacket[expr] is a MathLink packet that contains the expression expr, the result of an EnterExpressionPacket evaluation.

$Epilog (Built-in Mathematica Symbol)

$Epilog is a symbol whose value, if any, is evaluated when a dialog or a Mathematica session is terminated.

Input and Output in Notebooks (Mathematica Overview)

Entering Greek Letters Entering Two-Dimensional Input Editing and Evaluating Two-Dimensional Expressions

Numerical Operations on Functions (Mathematica Overview)

Arithmetic Numerical Mathematics in Mathematica The Uncertainties of Numerical Mathematics