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Visar resultat 6 - 10 av 150 avhandlingar som matchar ovanstående sökkriterier.

1. 6. Positive vector bundles in complex and convex geometry

   Författare :Hossein Raufi; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Nakano positivity; vanishing theorems; Prekopa theorem; Griffiths positivity; convex geometry; Ohsawa-Takegoshi extension theorem; dbar-equation; L^2-estimates; singular hermitian metrics; holomorphic vector bundles; holomorphic vector bundles; dbar-equation; L^2-estimates; singular hermitian metrics; Griffiths positivity; Nakano positivity; vanishing theorems; Ohsawa-Takegoshi extension theorem; convex geometry; Prekopa theorem;

   Sammanfattning : This thesis concerns various aspects of the geometry of holomorphic vector bundles and their analytical theory which all, vaguely speaking, are related to the notion of positive curvature in general, and L^2-methods for the dbar-equation in particular. The thesis contains four papers. LÄS MER

3. 7. Blow-ups and normal bundles in derived algebraic geometry and beyond

   Författare :Jeroen Hekking; David Rydh; Marco Robalo; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; derived algebraic geometry; blow-ups; normal bundles; Weil restrictions; Matematik; Mathematics;

   Sammanfattning : The main part of this thesis, Part II, consists of four papers. A summary and background is provided in Part I.Paper A introduces blow-ups of derived schemes in arbitrary centers, which is a generalization of the quasi-smooth case from [KR19]. LÄS MER

4. 8. Social-ecological dynamics of ecosystem service bundles

   Författare :Megan Meacham; Albert V. Norström; Garry D. Peterson; Dagmar Haase; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ecosystem services; multifunctionality; landscape; patterns; cluster; drivers; mapping; trade-offs; synergies; sustainability; land use; landscape management; Sweden; Sustainability Science; vetenskap om hållbar utveckling;

   Sammanfattning : The environments in which we live are complex, adapting and evolving in non-linear ways. The ecosystem services produced in landscapes supply resources, support livelihoods and are foundational to human wellbeing. LÄS MER

5. 9. Mathematical Foundations of Equivariant Neural Networks

   Författare :Jimmy Aronsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; symmetry; geometric deep learning; gauge theory; induced representations; fiber bundles; convolutional neural networks; equivariance;

   Sammanfattning : Deep learning has revolutionized industry and academic research. Over the past decade, neural networks have been used to solve a multitude of previously unsolved problems and to significantly improve the state of the art on other tasks. However, training a neural network typically requires large amounts of data and computational resources. LÄS MER

7. 10. Ga-actions on Complex Affine Threefolds

   Författare :Isac Hedén; Heinz Fieseler; Lucy Moser-Jauslin; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Complex affine varieties; algebraic group actions of C^ and C^*; locally nilpotent derivations; graded algebras; principal bundles; Russell s hypersurface;

   Sammanfattning : This  thesis  consists  of two papers  and  a summary.  The  papers  both  deal with  affine algebraic complex  varieties,  and  in particular such  varieties  in dimension  three  that have a non-trivial action  of one of the  one-dimensional  algebraic  groups  Ga   :=  (C, +) and  Gm  :=  (C*, ·). LÄS MER