PolynomialExtendedGCD[poly_1, poly_2, x] gives the extended GCD of poly_1 and poly_2 treated as univariate polynomials in x.PolynomialExtendedGCD[poly_1, poly_2, x, Modulus ...

PseudoInverse[m] finds the pseudoinverse of a rectangular matrix.

Fold[f, x, list] gives the last element of FoldList[f, x, list].

MapAll[f, expr] or f //@ expr applies f to every subexpression in expr.

Functions for manipulating elements in explicit lists. This gives a list with x prepended. This inserts x so that it becomes element number 2.

Drop[list, n] gives list with its first n elements dropped. Drop[list, -n] gives list with its last n elements dropped. Drop[list, {n}] gives list with its n\[Null]^th ...

BSplineBasis[d, x] gives the zeroth uniform B-spline basis function of degree d at x.BSplineBasis[d, n, x] gives the n\[Null]^th uniform B-spline basis function of degree ...

Mathematica contains some powerful primitives for making structural changes to expressions. You can use these primitives both to implement mathematical properties such as ...

Choose Insert > Table/Matrix > New. Use the dialog box that pops up to create a matrix. Suppose the entry in the top-left position is selected.

GeometricMean[list] gives the geometric mean of the values in list.