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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.

J_(nualphabeta)^mu=J_(nubetaalpha)^mu=1/2(R_(alphanubeta)^mu+R_(betanualpha)^mu), where R is the Riemann tensor.

A nonlinear deconvolution technique used in deconvolving images from the Hubble Space Telescope before corrective optics were installed.

S_n=sum_(i)eta_imu(E_i), where mu(E_i) is the measure of the set E_i of points on the x-axis for which f(x) approx eta_i.

Also known as the alternating series test. Given a series sum_(n=1)^infty(-1)^(n+1)a_n with a_n>0, if a_n is monotonic decreasing as n->infty and lim_(n->infty)a_n=0, then ...

An attracting set to which orbits or trajectories converge and upon which trajectories are periodic.