C∞-Algebraic Geometry with Corners
C∞-Algebraic Geometry with Corners

Author: Kelli Francis-Staite

Publisher: Cambridge University Press

Published: 2023-12-31

Total Pages: 224

ISBN-13: 1009400207

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Schemes in algebraic geometry can have singular points, whereas differential geometers typically focus on manifolds which are nonsingular. However, there is a class of schemes, 'C∞-schemes', which allow differential geometers to study a huge range of singular spaces, including 'infinitesimals' and infinite-dimensional spaces. These are applied in synthetic differential geometry, and derived differential geometry, the study of 'derived manifolds'. Differential geometers also study manifolds with corners. The cube is a 3-dimensional manifold with corners, with boundary the six square faces. This book introduces 'C∞-schemes with corners', singular spaces in differential geometry with good notions of boundary and corners. They can be used to define 'derived manifolds with corners' and 'derived orbifolds with corners'. These have applications to major areas of symplectic geometry involving moduli spaces of J-holomorphic curves. This work will be a welcome source of information and inspiration for graduate students and researchers working in differential or algebraic geometry.

C?-Algebraic Geometry with Corners
C?-Algebraic Geometry with Corners

Author: Kelli Francis-Staite

Publisher: Cambridge University Press

Published: 2023-12-31

Total Pages: 223

ISBN-13: 1009400169

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Crossing the boundary between differential and algebraic geometry in order to study singular spaces, this book introduces 'C∞-schemes with corners'.

Algebraic Geometry over C∞-Rings
Algebraic Geometry over C∞-Rings

Author: Dominic Joyce

Publisher: American Mathematical Soc.

Published: 2019-09-05

Total Pages: 139

ISBN-13: 1470436450

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If X is a manifold then the R-algebra C∞(X) of smooth functions c:X→R is a C∞-ring. That is, for each smooth function f:Rn→R there is an n-fold operation Φf:C∞(X)n→C∞(X) acting by Φf:(c1,…,cn)↦f(c1,…,cn), and these operations Φf satisfy many natural identities. Thus, C∞(X) actually has a far richer structure than the obvious R-algebra structure. The author explains the foundations of a version of algebraic geometry in which rings or algebras are replaced by C∞-rings. As schemes are the basic objects in algebraic geometry, the new basic objects are C∞-schemes, a category of geometric objects which generalize manifolds and whose morphisms generalize smooth maps. The author also studies quasicoherent sheaves on C∞-schemes, and C∞-stacks, in particular Deligne-Mumford C∞-stacks, a 2-category of geometric objects generalizing orbifolds. Many of these ideas are not new: C∞-rings and C∞ -schemes have long been part of synthetic differential geometry. But the author develops them in new directions. In earlier publications, the author used these tools to define d-manifolds and d-orbifolds, “derived” versions of manifolds and orbifolds related to Spivak's “derived manifolds”.

Groups and Graphs, Designs and Dynamics
Groups and Graphs, Designs and Dynamics

Author: R. A. Bailey

Publisher: Cambridge University Press

Published: 2024-05-30

Total Pages: 452

ISBN-13: 1009465945

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This collection of four short courses looks at group representations, graph spectra, statistical optimality, and symbolic dynamics, highlighting their common roots in linear algebra. It leads students from the very beginnings in linear algebra to high-level applications: representations of finite groups, leading to probability models and harmonic analysis; eigenvalues of growing graphs from quantum probability techniques; statistical optimality of designs from Laplacian eigenvalues of graphs; and symbolic dynamics, applying matrix stability and K-theory. An invaluable resource for researchers and beginning Ph.D. students, this book includes copious exercises, notes, and references.

Surveys in Combinatorics 2024
Surveys in Combinatorics 2024

Author: Felix Fischer

Publisher: Cambridge University Press

Published: 2024-06-13

Total Pages: 305

ISBN-13: 1009490532

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This volume contains surveys of current research directions in combinatorics written by leading researchers in their fields.

Operator Algebras, Quantization, and Noncommutative Geometry
Operator Algebras, Quantization, and Noncommutative Geometry

Author: Robert S. Doran

Publisher: American Mathematical Soc.

Published: 2004

Total Pages: 434

ISBN-13: 0821834029

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John von Neumann and Marshall Stone were two giants of Twentieth Century mathematics. In honor of the 100th anniversary of their births, a mathematical celebration was organized featuring developments in fields where both men were major influences. This volume contains articles from the AMS Special Session, Operator Algebras, Quantization and Noncommutative Geometry: A Centennial Celebration in Honor of John von Neumann and Marshall H. Stone. Papers range from expository and refereed and cover a broad range of mathematical topics reflecting the fundamental ideas of von Neumann and Stone. Most contributions are expanded versions of the talks and were written exclusively for this volume. Included, among Also featured is a reprint of P.R. Halmos's The Legend of John von Neumann. The book is suitable for graduate students and researchers interested in operator algebras and applications, including noncommutative geometry.

Facets of Algebraic Geometry
Facets of Algebraic Geometry

Author: Paolo Aluffi

Publisher: Cambridge University Press

Published: 2022-04-07

Total Pages: 395

ISBN-13: 1108792510

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Written to honor the enduring influence of William Fulton, these articles present substantial contributions to algebraic geometry.

Real Algebraic Geometry and Ordered Structures
Real Algebraic Geometry and Ordered Structures

Author: Charles N. Delzell

Publisher: American Mathematical Soc.

Published: 2000

Total Pages: 320

ISBN-13: 0821808044

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This volume contains 16 carefully refereed articles by participants in the Special Semester and the AMS Special Session on Real Algebraic Geometry and Ordered Structures held at Louisiana State University and Southern University (Baton Rouge). The 23 contributors to this volume were among the 75 mathematicians from 15 countries who participated in the special semester. Topics include the topology of real algebraic curves (Hilbert's 16th problem), moduli of real algebraic curves, effective sums of squares of real forms (Hilbert's 17th problem), efficient real quantifier elimination, subanalytic sets and stratifications, semialgebraic singularity theory, radial vector fields, exponential functions and valuations on nonarchimedean ordered fields, valued field extensions, partially ordered and lattice-ordered rings, rings of continuous functions, spectra of rings, and abstract spaces of (higher-level) orderings and real places. This volume provides a good overview of the state of the art in this area in the 1990s. It includes both expository and original research papers by top workers in this thriving field. The authors and editors strived to make the volume useful to a wide audience (including students and researchers) interested in real algebraic geometry and ordered structures-two subjects that are obviously related, but seldom brought together.