It is shown that an L function is unimodal if its Lévy spectral function has support on (-∞, 0] or on [ 0, ∞), and that this implies that every L function is the convolution of at most two unimodal L ...

Research in the field of nonparametric shape constrained regression has been intensive. However, only few publications explicitly deal with unimodality although there is need for such methods in ...