AffineTransform[m] gives a TransformationFunction that represents an affine transform that maps r to m.r. AffineTransform[{m, v}] gives an affine transform that maps r to m.r ...
IdentityMatrix[n] gives the n*n identity matrix.
MatchingDissimilarity[u, v] gives the matching dissimilarity between Boolean vectors u and v.
MatrixQ
(Built-in Mathematica Symbol) MatrixQ[expr] gives True if expr is a list of lists or a two-dimensional SparseArray object that can represent a matrix, and gives False otherwise. MatrixQ[expr, test] gives ...
MonomialList[poly] gives the list of all monomials in the polynomial poly.MonomialList[poly, {x_1, x_2, ...}] gives the list of monomials with respect to the variables x_i in ...
Primes
(Built-in Mathematica Symbol) Primes represents the domain of prime numbers, as in x \[Element] Primes.
PrincipalComponents[matrix] transforms elements of matrix into unscaled principal components.
SymmetricMatrixQ[m] tests whether m is a symmetric matrix.
Times
(Built-in Mathematica Symbol) x*y*z, x*y*z, or x y z represents a product of terms.
Tr
(Built-in Mathematica Symbol) Tr[list] finds the trace of the matrix or tensor list. Tr[list, f] finds a generalized trace, combining terms with f instead of Plus. Tr[list, f, n] goes down to level n in ...