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math.NA2017★ 2 cited
Complex best -term approximations almost always exist in finite dimensions
Yang Qi, Mateusz Michałek, Lek-Heng Lim
We show that in finite-dimensional nonlinear approximations, the best -term approximant of a function almost always exists over but that the same is not true ov…
math.NA2014★ 5 cited
Uniqueness of Nonnegative Tensor Approximations
Yang Qi, Pierre Comon, Lek-Heng Lim
We show that for a nonnegative tensor, a best nonnegative rank-r approximation is almost always unique, its best rank-one approximation may always be chosen to be a best nonnegativ…