Quantum cohomology is a branch of mathematics that combines concepts from algebraic geometry, symplectic geometry, and quantum physics. It arises in the study of certain moduli spaces and has applications in various fields, including string theory, mathematical physics, and enumerative geometry. At a high level, quantum cohomology seeks to extend classical cohomology theories, particularly for projective varieties, to incorporate quantum effects, which can be thought of as counting curves under certain conditions.
In the context of cohomology, a pullback is a construction that allows you to take a cohomology class on a target space and "pull it back" to a cohomology class on a domain space via a continuous map. This is particularly common in algebraic topology and differential geometry. ### Formal Definition Let \( f: X \to Y \) be a continuous map between two topological spaces \( X \) and \( Y \).
P-adic cohomology is a branch of mathematics that studies the properties of algebraic varieties and schemes over p-adic fields using cohomological methods. It is particularly important in number theory, algebraic geometry, and arithmetic geometry, as it provides tools to understand the relationships between algebraic structures and their properties over p-adic numbers.
Nonabelian cohomology is a branch of mathematics that studies the cohomological properties of nonabelian structures, particularly in the context of group theory and algebraic geometry. It generalizes classical cohomology theories to contexts where the groups involved do not necessarily obey the commutative property, hence the term "nonabelian.
Motivic cohomology is a concept in algebraic geometry and topology that generalizes classical cohomology theories to the framework of algebraic varieties. It is particularly influential in the study of algebraic cycles, motives, and the relationship between algebraic geometry and topology. ### Background Motivic cohomology was introduced in the context of the theory of motives, which aims to unify various cohomological approaches to algebraic varieties.
Monsky–Washnitzer cohomology is a type of cohomology theory developed in the context of the study of schemes, particularly over fields of positive characteristic. It is named after mathematicians Paul Monsky and Michiel Washnitzer, who introduced the concept in 1970s. This cohomology theory is specifically designed to work with algebraic varieties defined over fields of characteristic \( p > 0 \) and offers a way to analyze their geometric and topological properties.
Local cohomology is a concept in algebraic geometry and commutative algebra that extends the notion of ordinary cohomology to study the local behavior of a module over a ring, particularly with respect to a specified ideal. It is particularly useful for understanding the properties of sheaves and modules around points in a space or in relation to certain subvarieties.
Cohomology theories are mathematical frameworks used in algebraic topology, algebraic geometry, and other areas to study the properties of topological spaces and algebraic structures. Here’s a list of notable cohomology theories, each with unique properties and applications: 1. **Singular Cohomology**: The most fundamental cohomology theory for topological spaces, using singular simplices. It is defined for any topological space and provides multiplicative structures.
Lie algebra cohomology is a mathematical concept that arises in the study of Lie algebras, which are algebraic structures used extensively in mathematics and physics to describe symmetries and conservation laws. Cohomology, in this context, refers to a homological algebra framework that helps in analyzing the structure and properties of Lie algebras.
Kähler differentials are a concept from algebraic geometry and commutative algebra. They arise in the context of the study of a ring \( R \) and its associated differentials with respect to a base field or a base ring. Specifically, Kähler differentials provide a way to study the infinitesimal behavior of functions and their properties on schemes.
Koszul cohomology is a concept from algebraic topology and homological algebra that arises in the context of differential graded algebras and the study of the algebraic invariants associated with topological spaces or algebraic varieties. It is named after Jean-Pierre Serre and Jean Koszul, who developed the foundational ideas related to this cohomology theory.
Infinitesimal cohomology is a concept from the field of algebraic geometry and is particularly associated with the study of formal schemes and deformation theory. It provides a way to study the local behavior of schemes using a "cohomological" approach that incorporates infinitesimal neighborhoods. In more detailed terms, infinitesimal cohomology typically arises in contexts involving the study of deformations of algebraic objects.
The Hodge–de Rham spectral sequence is a mathematical tool used in algebraic topology and differential geometry, specifically in the context of studying the relationships between differential forms on a smooth manifold and the topology of that manifold. This spectral sequence arises from the filtration provided by the Hodge decomposition theorem in conjunction with the de Rham complex of differential forms. ### Overview 1.
Group cohomology is a mathematical tool used in algebraic topology, group theory, and various other areas of mathematics. It provides a way to study the properties of groups using cohomological methods, which are analogous to those used in homology theory but focus on the algebraic structure associated with groups.
Gelfand–Fuks cohomology is a concept in the field of mathematics that arises from the study of infinite-dimensional Lie algebras and their representations. It provides a powerful tool for analyzing and understanding the structure of these algebras, particularly in the context of the theory of differential operators and the geometry of manifolds. The cohomology theory was developed by Israel Gelfand and Sergei Fuks in the 1960s.
Galois cohomology is a branch of mathematics that studies objects known as "cohomology groups" in the context of Galois theory, which is a part of algebra concerned with the symmetries of polynomial equations. To understand Galois cohomology, we start with a few key ideas: 1. **Galois Groups**: A Galois group is a group associated with a field extension, representing the symmetries of the roots of polynomials.
The term "Factor system" can refer to various concepts depending on the context, including mathematics, economics, and systems theory. Here are a few interpretations: 1. **Mathematics**: In mathematics, a factor system typically refers to a collection of factors that can be used to break down numbers or algebraic expressions into their constituent parts. For example, in number theory, factorization involves expressing a number as a product of its prime numbers.
Elliptic cohomology is a branch of algebraic topology that generalizes classical cohomology theories using the framework of elliptic curves and modular forms. It is an advanced topic that blends ideas from algebraic geometry, number theory, and homotopy theory. ### Key Features 1.
Dolbeault cohomology is a mathematical concept that arises in the field of complex differential geometry and algebraic geometry. It provides a way to study the properties of complex manifolds by using differential forms. In essence, Dolbeault cohomology is a specific kind of cohomology theory that is particularly suited to complex manifolds. While ordinary cohomology deals with real-valued differential forms, Dolbeault cohomology focuses specifically on complex-valued differential forms.
Deligne cohomology is a cohomology theory that generalizes the classical notions of singular cohomology by incorporating additional structures, specifically those related to sheaf theory and algebraic geometry. It was introduced by Pierre Deligne in the context of his work on the Weil conjectures and arithmetic geometry.