ObservabilityMatrix[ss] gives the observability matrix of the StateSpaceModel object ss.
PrivateEvaluationOptions -> {opt_1 -> val_1, opt_2 -> val_2} is an option for selections that specifies settings for evaluation-related suboptions.
PrivatePaths -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies settings for paths private to the notebook front end.
Quit
(Built-in Mathematica Symbol) Quit[] terminates a Mathematica kernel session.
RasterSize is an option for Rasterize and related functions that determines the absolute pixel size of the raster generated.
TopologicalSort[g] gives a list of vertices of g in topologically sorted order for a directed acyclic graph g.
WeightedGraphQ[g] yields True if the graph g is a weighted graph and False otherwise.
$MessageList is a global variable that gives a list of the names of messages generated during the evaluation of the current input line.
$ModuleNumber gives the current serial number to be used for local variables that are created.
Other tutorials have discussed explicit loading of Mathematica packages using <<package and Needs[package]. Sometimes, however, you may want to set Mathematica up so that it ...