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The Laplacian for a scalar function phi is a scalar differential operator defined by (1) where the h_i are the scale factors of the coordinate system (Weinberg 1972, p. 109; ...

Euler's series transformation is a transformation that sometimes accelerates the rate of convergence for an alternating series. Given a convergent alternating series with sum ...

A projection matrix P is an n×n square matrix that gives a vector space projection from R^n to a subspace W. The columns of P are the projections of the standard basis ...

An operator A^~ such that A^~^2=A^~ or an element of an algebra x such that x^2=x.

A basis, form, function, etc., in two or more variables is said to be multilinear if it is linear in each variable separately.

An operator in logic which returns either true or false.

An operator definition of a function. A Rodrigues formula may be converted into a Schläfli integral.

The word "spectrum" confusingly has a number of unrelated meanings in various branches of mathematics.

A surface represented parametrically by elliptic functions.

Let (X,tau) be a topological space, and let p in X. Then the arc component of p is union {A subset= X:A is an arc and p in A}.