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The Quantum Mechanical Nature of Non-Invertible Symmetries

Theoretical physicists from Kavli IPMU have demonstrated that any non-invertible symmetry operation in theoretical physics is ...
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Non-Stationary q-Dependent Processes and Time-Varying Moving-Average Models: Invertibility Properties and the Forecasting Problem

The spectral factorization problem was solved in Hallin (1984) for the class of (non-stationary) m-variate MA(q) stochastic processes, i.e. the class of second-order q-dependent processes. It was ...