MenuView[{lbl_1 -> expr_1, lbl_2 -> expr_2, ...}] represents an object in which selecting the menu item with label lbl_i displays expr_i. MenuView[{lbl_1 -> expr_1, lbl_2 -> ...

LQOutputRegulatorGains[ss, {q, r}] gives the optimal state feedback gain matrix for the StateSpaceModel object ss and the quadratic cost function with output and control ...

Inverse[m] gives the inverse of a square matrix m.

MakeBoxes[expr, form] is the low-level function used in Mathematica sessions to convert expressions into boxes. MakeBoxes[expr] is the function to convert expr to ...

Quotient[m, n] gives the integer quotient of m and n. Quotient[m, n, d] uses an offset d.

Together[expr] puts terms in a sum over a common denominator, and cancels factors in the result.

ShakeGraph[g, d] performs a random perturbation of the vertices of graph g, with each vertex moving, at most, a distance d from its original position.

In catering to the fine points of mathematical typesetting and notational clarity, Mathematica provides a variety of special variant forms of letters.

p_1 | p_2 | ... is a pattern object which represents any of the patterns p_i.

Axis is a symbol that represents the axis for purposes of alignment and positioning.