$Packages (Built-in Mathematica Symbol)

$Packages gives a list of the contexts corresponding to all packages which have been loaded in your current Mathematica session.

$SessionID (Built-in Mathematica Symbol)

$SessionID is a number set up to be unique to a particular Mathematica session.

Numerical Methods for Solving the ... (Mathematica Tutorial)

The Lotka–Volterra system arises in mathematical biology and models the growth of animal species. Consider two species where Y_1(T) denotes the number of predators and Y_2(T) ...

$TimeZone (Built-in Mathematica Symbol)

$TimeZone gives the current time zone to assume for dates and times.

$ProcessorCount (Built-in Mathematica Symbol)

$ProcessorCount gives the number of processor cores available on the computer system on which Mathematica is being run.

SMILES (.smi) (Mathematica Import/Export Format)

MIME type: chemical/x-daylight-smiles SMILES chemical format. Commonly used to describe the structure of chemical molecules. SMILES is an acronym for Simplified Molecular ...

PoleZeroMarkers (Built-in Mathematica Symbol)

PoleZeroMarkers is an option for RootLocusPlot that specifies the markers to be drawn on the complex plane at the open-loop poles, closed-loop poles, and open-loop zeros.

$Path (Built-in Mathematica Symbol)

$Path gives the default list of directories to search in attempting to find an external file.

Standalone Mathematica Kernels (Mathematica Guide)

Mathematica's core language and computation capabilities can be accessed not only through its rich interactive notebook interface, but also directly through a command-line ...

[Right-click] > Show Cell (Mathematica Menu Item)

Show Cell toggles between the expression and display forms of a cell.