Dot
(Built-in Mathematica Symbol) a.b.c or Dot[a, b, c] gives products of vectors, matrices, and tensors.
Eigenvectors[m] gives a list of the eigenvectors of the square matrix m. Eigenvectors[{m, a}] gives the generalized eigenvectors of m with respect to a. Eigenvectors[m, k] ...
LyapunovSolve[a, c] finds a solution x of the matrix Lyapunov equation a.x + x.a\[ConjugateTranspose] == c.LyapunovSolve[a, b, c] solves a.x + x.b == c.LyapunovSolve[{a, d}, ...
Mathematica normally organizes the cells in a notebook automatically into hierarchical groups. Double-clicking lets you show only the heading cell of a group, or only a ...
AppendTo[s, elem] appends elem to the value of s, and resets s to the result.
DualSystemsModel[ss] gives the dual of the StateSpaceModel object ss.
EdgeRules[g] gives the list of edge rules for the graph g.
PermutationOrder[perm] gives the order of permutation perm.
PrependTo[s, elem] prepends elem to the value of s, and resets s to the result.
RowAlignments is an option for the low-level function GridBox that specifies how entries in each row should be aligned.