$ContextPath (Built-in Mathematica Symbol)

$ContextPath is a global variable that gives a list of contexts, after $Context, to search in trying to find a symbol that has been entered.

$CurrentLink (Built-in Mathematica Symbol)

$CurrentLink is the LinkObject representing the MathLink connection for an external program currently being installed or being called.

$KernelID (Built-in Mathematica Symbol)

$KernelID is a unique ID number assigned to each running parallel kernel.

$MaxNumber (Built-in Mathematica Symbol)

$MaxNumber gives the maximum arbitrary-precision number that can be represented on a particular computer system.

Files for Packages (Mathematica Tutorial)

When you create or use Mathematica packages, you will often want to refer to files in a system-independent way. You can use contexts to do this. The basic idea is that on ...

Newlines and Tabs in Strings (Mathematica Tutorial)

Explicit representations of newlines and tabs in strings. This prints on two lines. In InputForm there is an explicit ∖n to represent the newline.

Putting Expressions into Different Forms (Mathematica Tutorial)

Complicated algebraic expressions can usually be written in many different ways. Mathematica provides a variety of functions for converting expressions from one form to ...

Typing Square Roots (Mathematica Tutorial)

To get a square root sign, press the Control key and the 2 key at the same time. Press Ctrl+2 or Ctrl+@. Type inside the placeholder (which is already selected).

Plot Legends Package (Plot Legends Package Tutorial)

There are two ways to use the functions in this package to place a legend in a graphic: the first can only be used as an option to the built-in functions Plot, ListPlot and ...

NSum (Built-in Mathematica Symbol)

NSum[f, {i, i_min, i_max}] gives a numerical approximation to the sum \[Sum]i = i_min i_max f.NSum[f, {i, i_min, i_max, di}] uses a step di in the sum.