Essays about: "Eric Ahlqvist"
Found 3 essays containing the words Eric Ahlqvist.
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1. Operations on Étale Sheaves of Sets
University essay from KTH/Matematik (Avd.)Abstract : Rydh showed in 2011 that any unramified morphism ƒof algebraic spaces (algebraic stacks) has a canonical and universal factorization through an algebraic space (algebraic stack) called the étale envelope of ƒ, where the first morphism is a closed immersion and the second is étale. We show that when ƒ is étale then the étale envelope can be described by applying the left adjoint of the pullback of ƒ to the constant sheaf defined by a pointed set with two elements. READ MORE
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2. Saturated Fusion Systems
University essay from KTH/Skolan för teknikvetenskap (SCI)Abstract : A fusion system is a category on a nite p-group, P, which encodes "conjugacy" relations among the subgroups of P. In this thesis fusion systems of nite groups and ways to prove saturation of abstract fusion systems is investigated. First an introduction to fusion systems of nite groups and the notion of abstract fusion systems is given. READ MORE
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3. Fusion Systems On Finite Groups and Alperin's Theorem
University essay from KTH/Skolan för teknikvetenskap (SCI)Abstract : Let G be a group and P a Sylow p-subgroup of G. A fusion system of G on P, denoted by FP (G), is the category with objects; subgroups of P, and morphisms induced by conjugation in G. This thesis gives a brief introduction to the theory fusion systems. Two classical theorems of Burnside and Frobenius are stated and proved. READ MORE