Unconditionality of orthogonal spline systems in H¹
Gegham Gevorkyan, Anna Kamont, Karen Keryan, Markus Passenbrunner (2015)
Studia Mathematica
Similarity:
We give a simple geometric characterization of knot sequences for which the corresponding orthonormal spline system of arbitrary order k is an unconditional basis in the atomic Hardy space H¹[0,1].