Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1337 for “"varieties"”.
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Degenerating abelian varieties via log abelian varieties
This thesis is based on the author's paper [52]. It extends the construction of log Tate curves from [25, §1] to higher dimensions. The approach involves extensive applications of algebraic spaces and higher-dimensional convex geometry to create diverse models for any given split totally degenerate …
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Fibered Calabi -Yau Varieties and Toric Varieties
… write weighted projective space bundles as toric varieties. We then find necessary and sufficient conditions for the anti-canonical linear systems of these bundles to have quasi-smooth members. These quasi-smooth members are Calabi-Yau varieties over the base whose general fiber is also a …
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Weight varieties
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1996.
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Secant varieties of Spinor varieties and of other generalized Grassmannians
Secant varieties are among the main protagonists in tensor decomposition, whose study involves both pure and applied mathematic areas. Despite they have been studied for decades, several aspects of their geometry are still mysterious, among which identifiability and singularity of their points. In …
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Projections of Varieties
This thesis is devoted to the study of varieties with the following property: if X is a smooth projectively normal variety in ('n), we say that X has the length one projection property if every isomorphic projection of X to ('n-1) has the property that the linear system cut out on it by the …
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Varieties of lattices
… the identities which it satisfies. The study of varieties of algebras provides some insight into this problem. Here we are concerned mainly with lattice varieties, about which a wealth of information has been obtained in the last twenty years. We begin with some preliminary results from universal …
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Varieties of personal aging
This study examines the attitudes and subjective perceptions of the aging process as experienced by male (6) and female (9) subjects in retirement, over the age sixty-five. Data drawn from interviews conducted in the subject's home and based on a questionnaire of twenty-three open-ended questions …
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Categorifications of Cluster Varieties
… we study additive categorifications of algebraic varieties whose coordinate rings admit a cluster algebra structure. The presence of a cluster structure has important implications for the geometry of a variety including the existence of canonical linearly independent sets of regular functions. …
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Differential operators on varieties,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1972.
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Infinite dimensional flag varieties
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, 1984
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Duality for projective varieties
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1985.
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Varieties of clausal complementation
This thesis argues that clausal arguments of mental-state predicates divide into two main types: those that express the content, or "subject matter" of the mental state, and those that express the cause of the mental state. My central theoretical claim is that this dichotomy corresponds to a …
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Complements on Log Canonical Fano Varieties and Index Conjecture of Log Calabi-Yau Varieties
… the theory of complements to log canonical Fano varieties and relate theory of complements to the index conjecture of log Calabi-Yau varieties. We mainly work over an algebraically closed field of characteristic zero, more specifically over C. We will first introduce some basic background theory …
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The Varieties of Writing Experience
Compostion.
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Finite bases for semigroup varieties
O objetivo deste trabalho é fornecer um atlas das bases de identidades para as variedades geradas por semigrupos e grupos de ordem pequena. Com o propósito de auxiliar os matemáticos que trabalham neste campo a encontrar informações com facilidade, foi implementado um website que executa em segundo …
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Rational Points on Lattice Varieties
Lattice varieties play an important role in several areas of mathematics. In this thesis we investigate the properties of rational points on lattice varieties over Witt vectors with algebraically closed residue field in prime characteristic. These varieties are defined over a finite field. For …
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Witt groups of complex varieties
The thesis Witt Groups of Complex Varieties studies and compares two related cohomology theories that arise in the areas of algebraic geometry and topology: the algebraic theory of Witt groups, and real topological K-theory. Specifically, we introduce comparison maps from the Grothendieck-Witt and …
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Amalgamation in varieties of algebras
… in universal algebra has been the study of varieties, initiated by Garett Birkhoff in the 1930's. Examples of varieties include many classes of algebras such as groups, semigroups, lattices and Boolean algebras. In 1927, O. Schreier showed that for any set of extensions of a given group, …
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Complex algebras, varieties and games
Complex algebras have proven very useful in presenting the modern day logician with a tool to approach a wide variety of problems in the field of algebraic logic. This dissertation is intended as an exploration of various approaches to the study of complex algebras. In particular we will take a …
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