DirectoryQ (Built-in Mathematica Symbol)

DirectoryQ["name"] gives True if the directory with the specified name exists, and gives False otherwise.

Editable (Built-in Mathematica Symbol)

Editable is an option for displayed objects, cells, and notebooks that specifies whether their contents can be edited interactively using the front end.

EllipticExpPrime (Built-in Mathematica Symbol)

EllipticExpPrime[u, {a, b}] gives the derivative of EllipticExp[u, {a, b}] with respect to u.

Evaluator (Built-in Mathematica Symbol)

Evaluator is an option for objects such as Button, Dynamic, and Cell that gives the name of the kernel to use to evaluate their contents.

ExponentialDistribution (Built-in Mathematica Symbol)

ExponentialDistribution[\[Lambda]] represents an exponential distribution with scale inversely proportional to parameter \[Lambda].

FileExistsQ (Built-in Mathematica Symbol)

FileExistsQ["name"] gives True if the file with the specified name exists, and gives False otherwise.

FilterRules (Built-in Mathematica Symbol)

FilterRules[rules, patt] filters the list rules by picking out only those rules whose left-hand sides match patt.FilterRules[rules, {patt_1, patt_2, ...}] picks out rules ...

FlattenAt (Built-in Mathematica Symbol)

FlattenAt[list, n] flattens out a sublist that appears as the n\[Null] th element of list. If n is negative, the position is counted from the end. FlattenAt[expr, {i, j, ...

FrameBox (Built-in Mathematica Symbol)

FrameBox[box] is a low-level box construct which represents box with a frame drawn around it.

GeoDestination (Built-in Mathematica Symbol)

GeoDestination[pos, {d, \[Alpha]}] gives the geodetic position reached by going distance d in azimuthal direction \[Alpha] from pos.