Nonconvex penalties including the smoothly clipped absolute deviation penalty and the minimax concave penalty enjoy the properties of unbiasedness, continuity a
Let N be a nest on a Banach space X,and AlgN be the associated nest algebra.It is shown that,if there exists a non-trivial element N in N which is complemented
In 1999,Kim and Kwak asked one question that 'Is a ring R 2-primal if OP■P for each P ∈ mSpec(R)?'.In this paper,we prove that if O P has the IFP for