$MachineAddresses gives a list of strings specifying the current IP addresses associated with the computer on which Mathematica is being run.
Regularization is an option for Sum and Product that specifies what type of regularization to use.
DeleteCases[expr, pattern] removes all elements of expr that match pattern. DeleteCases[expr, pattern, levelspec] removes all parts of expr on levels specified by levelspec ...
NIntegrate[f, {x, x_min, x_max}] gives a numerical approximation to the integral \[Integral]_x_min^x_max\ f\ d \ x. NIntegrate[f, {x, x_min, x_max}, {y, y_min, y_max}, ...] ...
DSolve
(Built-in Mathematica Symbol) DSolve[eqn, y, x] solves a differential equation for the function y, with independent variable x. DSolve[{eqn_1, eqn_2, ...}, {y_1, y_2, ...}, x] solves a list of ...
TrekParameters is an option to EquationTrekker that specifies the dynamic parameters and their ranges.
Control
(Built-in Mathematica Symbol) Control[{u, dom}] represents an interactive control for the variable u in the domain dom, with the type of control chosen to be appropriate for the domain ...
WeatherData[loc, " property"] gives the most recent measurement for the specified weather property at the location corresponding to loc.WeatherData[loc, " property", date] ...
LQRegulatorGains[ss, {q, r}] gives the optimal state feedback gain matrix for the StateSpaceModel object ss and the quadratic cost function with state and control weighting ...
Widget["Table"] represents a table.