Browsing Matematisk institutt by Title
Now showing items 415-434 of 3771
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)We study ordinary differential equations (ODEs) with vector fields given by general Schwartz distributions, and we show that if we perturb such an equation by adding an “infinitely regularizing” path, then it has a unique ...
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(Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)We introduce algebraic dynamical systems, which consist of an action of a right LCM semigroup by injective endomorphisms of a group. To each algebraic dynamical system we associate a C*-algebra and describe it as a semigroup ...
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Abstract We study C*-algebras generated by left regular representations of right LCM one-relator monoids and Artin–Tits monoids of finite type. We obtain structural results concerning nuclearity, ideal structure and pure ...
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(Doctoral thesis / Doktoravhandling, 2023)Mathematical objects often possess some sort of 'symmetry'. For instance, the circle has rotational symmetry; It 'looks the same' even if we rotate it around its center by some angle. Formally this type of symmetry is an ...
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(Doctoral thesis / Doktoravhandling, 2012)
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(Research report / Forskningsrapport, 1994)
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)We study C*-irreducibility of inclusions of reduced twisted group C*-algebras and of reduced group C*-algebras. We characterize C*-irreducibility in the case of an inclusion arising from a normal subgroup, and exhibit many ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)We study non-ascending HNN extensions acting on their Bass– Serre tree and characterize C*-simplicity and the unique trace property by means of the kernel and quasi-kernels of the HNN extension in question. We also present ...
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(Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)In this paper we construct a new type of noise of fractional nature that has a strong regularizing effect on differential equations. We consider an equation with this noise with a highly irregular coefficient. We employ a ...
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(Master thesis / Masteroppgave, 2015)This thesis is devoted to the simultaneous estimation of the means of p> 1 independent Poisson distributions. A novel loss function that penalizes bad estimates of each of the means and the sum of the means is introduced. ...
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(Research report / Forskningsrapport, 1993)
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(Master thesis / Masteroppgave, 2013)We study regime-switching models for stocks and interest rates. We define these models modifications of the classical models created by Black & Scholes and Vasicek for stocks and interest rates, respectively. The problem ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)The instability and vortex shedding in the bottom boundary layer caused by internal solitary waves of depression propagating along a shallow pycnocline of a fluid are computed by finite-volume code in two dimensions. The ...
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(Master thesis / Masteroppgave, 2015)Due to regulation reasons, life insurance undertakings have long been struggling with interest rate variations. In the post-financial-crisis era, most life insurance firms in Western countries are facing two major challenges, ...
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(Research report / Forskningsrapport, 1999)
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(Doctoral thesis / Doktoravhandling, 2019)
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(Master thesis / Masteroppgave, 2012)The background for this thesis is the work on broccoli curves by Gathmann, Markwig and Schroeter. In their paper, broccoli curves are introduced in order to give a tropical proof of the invariance of tropical Welschinger ...
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(Research report / Forskningsrapport, 1994)
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(Research report / Forskningsrapport, 2004)The purpose of this paper is to construct the calculus of variations for general zero mean processes with independent increments and, in particular for Lévy processes. The calculus based on the operators D and $\delta$, ...