Topics on Harmonic analysis and Multilinear Algebra

The present thesis consists of six different papers. Indeed, they treat three different research areas: function spaces, singular integrals and multilinear algebra. In paper I, a characterization of continuity of the $p$-$\Lambda$-variation function is given and Helly's selection principle for \Lambda BV^(p) functions is established. A characterization of the inclusion of Waterman-Shiba classes into classes of functions with given integral modulus of continuity is given. A useful estimate on the modulus of variation of functions of class \Lambda BV^(p) is found. In paper II, a characterization of the inclusion of Waterman-Shiba classes into H_ω^q is given. This corrects and extends an earlier result of a paper from 2005. In paper III, the characterization of the inclusion of Waterman-Shiba spaces \:\Lambda BV^(p)\: into generalized Wiener classes of functions BV(q; δ) is given. It uses a new and shorter proof and extends an earlier result of U. Goginava. In paper IV, we discuss the existence of an orthogonal basis consisting of decomposable vectors for all symmetry classes of tensors associated with Semi-dihedral groups SD_8n. In paper V, we discuss o-bases of symmetry classes of tensors associated with the irreducible Brauer characters of the Dicyclic and Semi-dihedral groups. As in the case of Dihedral groups [46], it is possible that V_\phi(G) has no o-basis when $\phi$ is a linear Brauer character. Let \vec{P}=(p₁,\dotsc,p_m) with 1<p₁,\dotsc,p_m<\infty, 1/p₁+\dotsb+1/p_m=1/p and \vec{w}=(w₁,\dotsc,w_m)\in A_\vec{P}. In paper VI, we investigate the weighted bounds with dependence on aperture α for multilinear square functions S_α,\psi(\vec{f}). We show that $ \|S_α,\psi(\vec{f})\|_{L^p(\nu\vec{w})} \leq C_{n,m,\psi,\vec{P}}~ α^mn[\vec{w}]_A\vec{P}^{\max(\frac{1}{2},\tfrac{p₁'}{p},\dotsc,\tfrac{p_m'}{p})} \prod_i=1^m \|f_i\|_L^pi(wi). $ This result extends the result in the linear case which was obtained by Lerner in 2014. Our proof is based on the local mean oscillation technique presented firstly to find the sharp weighted bounds for Calder\'on--Zygmund operators. This method helps us avoiding intrinsic square functions in the proof of our main result.

Author dc:creator

• Hormozi, Mahdi

• Generalized bounded variation
• Helly's theorem
• Modulus of variation
• Generalized Wiener classes
• Symmetry classes of tensors
• Orthogonal basis
• Brauer symmetry classes of tensors
• Multilinear singular integrals
• weighted norm inequalities
• weighted bounds
• local mean oscillation
• Lerner's formula

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/2077/39305

OAI record oai:identifier

https://gupea.ub.gu.se/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Agupea.ub.gu.se%3A2077%2F39305