26 citations · 77 across the 18 of their papers we have counts for
23 papers
The Strong Matrix Weighted Maximal Operator
Emil Vuorinen
The purpose of this note is to prove that the strong Christ-Goldberg maximal function is bounded. This is a matrix weighted maximal operator appearing in the theory of matrix weigh…
Exotic Calderón-Zygmund operators
Tuomas Hytönen, Kangwei Li, Henri Martikainen +1
We study singular integral operators with kernels that are more singular than standard Calderón-Zygmund kernels, but less singular than bi-parameter product Calderón-Zygmund kernel…
Multiresolution analysis and Zygmund dilations
Tuomas Hytönen, Kangwei Li, Henri Martikainen +1
Zygmund dilations are a group of dilations lying in between the standard product theory and the one-parameter setting - in $\mathbb{R}^3 = \mathbb{R} \times \mathbb{R} \times \math…
Genuinely multilinear weighted estimates for singular integrals in product spaces
Kangwei Li, Henri Martikainen, Emil Vuorinen
We prove genuinely multilinear weighted estimates for singular integrals in product spaces. The estimates complete the qualitative weighted theory in this setting. Such estimates w…
Modern singular integral theory with mild kernel regularity
Emil Airta, Henri Martikainen, Emil Vuorinen
We present a framework based on modified dyadic shifts to prove multiple results of modern singular integral theory under mild kernel regularity. Using new optimized representation…
Banach-valued multilinear singular integrals with modulation invariance
Francesco Di Plinio, Kangwei Li, Henri Martikainen +1
We prove that the class of trilinear multiplier forms with singularity over a one dimensional subspace, including the bilinear Hilbert transform, admit bounded -extension to t…
Some new weighted estimates on product spaces
Emil Airta, Kangwei Li, Henri Martikainen +1
We complete our theory of weighted estimates for bilinear bi-parameter Calderón--Zygmund operators under the assumption that…
Multilinear operator-valued Calderón-Zygmund theory
Francesco Di Plinio, Kangwei Li, Henri Martikainen +1
We develop a general theory of multilinear singular integrals with operator-valued kernels, acting on tuples of UMD Banach spaces. This, in particular, involves investigating multi…
Multilinear singular integrals on non-commutative spaces
Francesco Di Plinio, Kangwei Li, Henri Martikainen +1
We prove bounds for the extensions of standard multilinear Calderón-Zygmund operators to tuples of UMD spaces tied by a natural product structure. This can, for instance, mea…
End-point estimates, extrapolation for multilinear Muckenhoupt classes, and applications
Kangwei Li, José María Martell, Henri Martikainen +2
In this paper we present the results announced in the recent work by the first, second, and fourth authors of the current paper concerning Rubio de Francia extrapolation for the so…
Bloom type upper bounds in the product BMO setting
Kangwei Li, Henri Martikainen, Emil Vuorinen
For a bounded singular integral in and a bounded singular integral in we prove that $$ \| [T_n^1, [b, T_m^2]] \|_{L^p(μ) \to L^p(λ)} \less…
Quasi-Banach estimates of commutators of bilinear bi-parameter singular integrals: paraproducts
Kangwei Li, Henri Martikainen, Emil Vuorinen
We complete our boundedness theory of commutators of bilinear bi-parameter singular integrals by establishing the following result. If is a bilinear bi-parameter singular integ…
Bloom type inequality for bi-parameter singular integrals: efficient proof and iterated commutators
Kangwei Li, Henri Martikainen, Emil Vuorinen
Utilising some recent ideas from our bilinear bi-parameter theory, we give an efficient proof of a two-weight Bloom type inequality for iterated commutators of linear bi-parameter…
Commutators of bilinear bi-parameter singular integrals
Kangwei Li, Henri Martikainen, Emil Vuorinen
We study the boundedness properties of commutators formed by and , where is a bilinear bi-parameter singular integral satisfying natural type conditions and is…
Bilinear Calderón-Zygmund theory on product spaces
Kangwei Li, Henri Martikainen, Emil Vuorinen
We develop a wide general theory of bilinear bi-parameter singular integrals . First, we prove a dyadic representation theorem starting from assumptions and apply it to sho…
Multi-parameter estimates via operator-valued shifts
Tuomas Hytönen, Henri Martikainen, Emil Vuorinen
We prove new results for multi-parameter singular integrals. For example, we prove that bi-parameter singular integrals in satisfying natural type condition…
Bilinear representation theorem
Kangwei Li, Henri Martikainen, Yumeng Ou +1
We represent a general bilinear Calderón-Zygmund operator as a sum of simple dyadic operators. The appearing dyadic operators also admit a simple proof of a sparse bound. In partic…
Dyadic-probabilistic methods in bilinear analysis
Henri Martikainen, Emil Vuorinen
We demonstrate and develop dyadic-probabilistic methods in connection with non-homogeneous bilinear operators, namely singular integrals and square functions. We develop the full n…
A Two-weight inequality between and
Tuomas Hytönen, Emil Vuorinen
We consider boundedness of a certain positive dyadic operator that arose during our attempts to develop a two-weight theory for the…
Non-homogeneous square functions on general sets: suppression and big pieces methods
Henri Martikainen, Mihalis Mourgoglou, Emil Vuorinen
We aim to showcase the wide applicability and power of the big pieces and suppression methods in the theory of local theorems. The setting is new: we consider conical square f…
A new approach to non-homogeneous local theorems
Henri Martikainen, Mihalis Mourgoglou, Emil Vuorinen
We develop a new general method to prove various non-doubling local Tb theorems. The method combines the non-homogeneous good lambda method of Tolsa, the big pieces Tb theorem of N…
Two weight -inequalities for dyadic shifts and the dyadic square function
Emil Vuorinen
We consider two weight -inequalities for dyadic shifts and the dyadic square function with general exponents . It is shown that if a so-called quadrat…
L^{p}(μ)-L^{q}(ν) characterization for well localized operators
Emil Vuorinen
We consider a two weight -inequality for well localized operators as defined and studied by F. Nazarov, S. Treil and A. Volberg when . A counterexampl…