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dtau^2=-eta_(alphabeta)dxi^alphadxi^beta, or (d^2xi^alpha)/(dtau^2)=0.

A type of flow technically defined in terms of the tangent bundle of a manifold.

The integral associated with the Haar measure.

A system of variables which can be written in the form of Hamilton's equations.

Two nonsingular forms are equivalent over the rationals iff they have the same determinant and the same p-signatures for all p.

A fixed point for which the stability matrix has equal nonzero eigenvectors.

A rectifiable current whose boundary is also a rectifiable current.

A linear deconvolution algorithm.

An operator of period 2, i.e., an operator * which satisfies ((a)^*)^*=a.

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