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For the Helmholtz differential equation to be separable in a coordinate system, the scale factors h_i in the Laplacian del ...

The Ree group R(q) is the automorphism group of a S(2,q+1,q^3+1) Steiner system.

Matrix diagonalization is the process of taking a square matrix and converting it into a special type of matrix--a so-called diagonal matrix--that shares the same fundamental ...

A nonhomogeneous linear equation or system of nonhomogeneous linear systems of equations is said to be affine.

A stable fixed point of a map which, in a dissipative dynamical system, is an attractor.

Conditions at an initial time t=t_0 from which a given set of mathematical equations or physical system evolves. A system with initial conditions specified is known as an ...

An integral of motion which restricts the phase space available to a dynamical system.

A system of parameter chain complexes used for multiplication on differential graded algebras up to homotopy.

The type of motion executed by a dynamical system containing two incommensurate frequencies.

The turning of an object or coordinate system by an angle about a fixed point. A rotation is an orientation-preserving orthogonal transformation. Euler's rotation theorem ...