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

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

A reduction system is called confluent (or globally confluent) if, for all x, u, and w such that x->_*u and x->_*w, there exists a z such that u->_*z and w->_*z. A reduction ...

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

A scalar is a one-component quantity that is invariant under rotations of the coordinate system.

The north pole is the point on a sphere with maximum z-coordinate for a given coordinate system. For a rotating sphere like the Earth, the natural coordinate system is ...

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 ...

The y- (vertical) coordinate of a point in a two dimensional coordinate system. Physicists and astronomers sometimes use the term to refer to the axis itself instead of the ...

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

Any system of phi(n) integers, where phi(n) is the totient function, representing all the residue classes relatively prime to n is called a reduced residue system (Nagell ...