Dot
(Built-in Mathematica Symbol) a.b.c or Dot[a, b, c] gives products of vectors, matrices, and tensors.
ExpIntegralE[n, z] gives the exponential integral function E_n (z).
n! gives the factorial of n.
Factor
(Built-in Mathematica Symbol) Factor[poly] factors a polynomial over the integers. Factor[poly, Modulus -> p] factors a polynomial modulo a prime p. Factor[poly, Extension -> {a_1, a_2, ...}] factors a ...
Flatten
(Built-in Mathematica Symbol) Flatten[list] flattens out nested lists. Flatten[list, n] flattens to level n. Flatten[list, n, h] flattens subexpressions with head h. Flatten[list, {{s_11, s_12, ...}, ...
FunctionExpand[expr] tries to expand out special and certain other functions in expr, when possible reducing compound arguments to simpler ones. FunctionExpand[expr, assum] ...
GaussianMatrix[r] gives a matrix that corresponds to a Gaussian kernel of radius r. GaussianMatrix[{r, \[Sigma]}] gives a matrix corresponding to a Gaussian kernel with ...
GraphLayout is an option to Graph and related functions that specifies what layout to use for graph components and collections of components.
JacobiCN[u, m] gives the Jacobi elliptic function cn(u | m).
JacobiDN[u, m] gives the Jacobi elliptic function dn(u | m).