On Unconditional and Absolute Convergence of the Haar Series in the Metric of $ L^{p}[0,1] $ with $ 0

Siberian Mathematical Journal - We prove that there exists a universal Haar series of the form $ \sum\nolimits_{k=0}^{\infty}a_{k}h_{k}(x) $ with $ a_{k}\searrow 0 $ such that, for all $...