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Ciesielski and Franklin systems

Gegham G. Gevorkyan — 2006

Banach Center Publications

A short survey of results on classical Franklin system, Ciesielski systems and general Franklin systems is given. The principal role of the investigations of Z. Ciesielski in the development of these three topics is presented. Recent results on general Franklin systems are discussed in more detail. Some open problems are posed.

General Franklin systems as bases in H¹[0,1]

Gegham G. GevorkyanAnna Kamont — 2005

Studia Mathematica

By a general Franklin system corresponding to a dense sequence of knots 𝓣 = (tₙ, n ≥ 0) in [0,1] we mean a sequence of orthonormal piecewise linear functions with knots 𝓣, that is, the nth function of the system has knots t₀, ..., tₙ. The main result of this paper is a characterization of sequences 𝓣 for which the corresponding general Franklin system is a basis or an unconditional basis in H¹[0,1].

Unconditionality of general Franklin systems in L p [ 0 , 1 ] , 1 < p < ∞

Gegham G. GevorkyanAnna Kamont — 2004

Studia Mathematica

By a general Franklin system corresponding to a dense sequence = (tₙ, n ≥ 0) of points in [0,1] we mean a sequence of orthonormal piecewise linear functions with knots , that is, the nth function of the system has knots t₀, ..., tₙ. The main result of this paper is that each general Franklin system is an unconditional basis in L p [ 0 , 1 ] , 1 < p < ∞.

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