Arithmetic Functions (Mathematica Guide)

Mathematica immediately allows you to do arithmetic not only with individual numbers, but also with arbitrary lists or arrays—as well as symbolic and algebraic forms. ...

DifferentialRoot (Built-in Mathematica Symbol)

DifferentialRoot[lde] represents a function that solves the linear differential equation specified by lde[y, x].

LibraryFunction (Built-in Mathematica Symbol)

LibraryFunction[args] represents a function that has been loaded from a Wolfram Library.

ButtonSource (Built-in Mathematica Symbol)

ButtonSource is an option for the low-level function ButtonBox that specifies the first argument to give to the ButtonFunction for the button when the button is active and is ...

Edit > Make Template (Mathematica Menu Item)

Make Template inserts a template based on a selected function name.

Expressions with Heads That Are Not ... (Mathematica Tutorial)

In most cases, you want the head f of a Mathematica expression like f[x] to be a single symbol. There are, however, some important applications of heads that are not symbols. ...

Head (Built-in Mathematica Symbol)

Head[expr] gives the head of expr.

KroneckerDelta (Built-in Mathematica Symbol)

KroneckerDelta[n_1, n_2, ...] gives the Kronecker delta \[Delta] Subscript[n, 1] Subscript[n, 2] ..., equal to 1 if all the n_i are equal, and 0 otherwise.

LibraryFunctionUnload (Built-in Mathematica Symbol)

LibraryFunctionUnload[fun] unloads a LibraryFunction so that it cannot be used.

LibraryFunctionInformation (Built-in Mathematica Symbol)

LibraryFunctionInformation[fun] returns information about a LibraryFunction.