# What Do You Know About Highest-weight Categories?

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In mathematics, the field of representational theory studies abstract algebraic structures by the using the linear transformation of vector spaces to represent their elements. The highest weight category is also one of this representational theory, it is a k-linear category, that has k as its field. This quiz will test your knowledge about the topic and introduce you to it if you are yet to know what it is.

• 1.

### The highest-weight category is a field that is...

• A.

Locally Artinian

• B.

Functionally spaced

• C.

A subset of G

• D.

Geometrical

A. Locally Artinian
• 2.

### What is the concept of highest-weight categories named after?

• A.

Lie group

• B.

Lie algebra

• C.

Boolean algebra

• D.

Fourier series

B. Lie algebra
Explanation
The concept of highest-weight categories is named after Lie algebra. Lie algebra is a mathematical structure that studies the algebraic properties of Lie groups, which are groups that have a smooth manifold structure. In Lie algebra, the highest-weight category refers to a category of representations of a Lie algebra, where each representation is labeled by a highest weight. This concept is fundamental in the study of Lie algebra and its representations, making Lie algebra the correct answer.

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• 3.

### If a finite-dimensional algebra has its module as the highest-weight category, what is it said to be?

• A.

Uni-hereditary

• B.

Para-hereditary

• C.

Quasi-hereditary

• D.

Tri-hereditary

C. Quasi-hereditary
Explanation
A finite-dimensional algebra whose module is the highest-weight category is said to be quasi-hereditary. Quasi-hereditary algebras have a well-behaved category of modules, where the modules can be organized into a chain of subcategories called standardly stratified modules. This allows for a nice classification and understanding of the module structure of the algebra.

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• 4.

### Several equivalent descriptions of the ______ can be used to provide several equivalent descriptions of highest-weight categories.

• A.

Abelian category

• B.

Amelian category

• C.

Henning category

• D.

Boolean category

A. Abelian category
Explanation
An Abelian category is a category that has certain properties, such as the existence of kernels and cokernels, and the ability to form direct sums and direct products. These properties allow for the construction of highest-weight categories, which are categories that have objects with a "highest weight" property. Therefore, an Abelian category can be used to provide several equivalent descriptions of highest-weight categories.

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• 5.

### Who introduced the concept of highest-weight categories?

• A.

Parshall, Davis and Craig

• B.

Davis, Craig and Cline

• C.

Cline, Steve and Davis

• D.

Parshall, Scott and Cline

D. Parshall, Scott and Cline
Explanation
Parshall, Scott, and Cline introduced the concept of highest-weight categories.

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• 6.

### What can monomorphism also be called?

• A.

Embeddings

• B.

EpimorpHs

• C.

Retraction

• D.

UnimorpHism

B. EpimorpHs
Explanation
Monomorphism can also be called "Epimorphs".

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• 7.

### A category is Abelian if it has how many objects?

• A.

Four

• B.

Three

• C.

Two

• D.

One

D. One
Explanation
A category is Abelian if it has one object. In category theory, a category is a mathematical structure that consists of objects and morphisms (arrows) between those objects. An Abelian category is a category that has certain properties, including the existence of kernels and cokernels for all morphisms, and the ability to define exact sequences. These properties make Abelian categories useful in various areas of mathematics, such as algebraic geometry and representation theory. Therefore, the correct answer is One.

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• 8.

### Which is one of the characteristics of the highest-weight categories?

• A.

PolymorpHisms are unique for every function

• B.

Zero objects are unique up to isomorpHism

• C.

Both A and B

• D.

Neither A and B

B. Zero objects are unique up to isomorpHism
Explanation
The correct answer is "Zero objects are unique up to isomorphism." This means that in the highest-weight categories, there are no distinct objects that have the same properties or characteristics. Instead, objects that are isomorphic, meaning they have the same structure or properties, are considered equivalent. This characteristic allows for a more abstract and general understanding of objects within these categories.

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• 9.

### What must the highest-weight category have?

• A.

Simple injectives

• B.

Enough injectives

• C.

Infinite subsets

• D.

Boolean algebra

B. Enough injectives
Explanation
The highest-weight category must have enough injectives. This means that for every object in the category, there must exist an injective morphism from that object to an injective object. Having enough injectives is important for various reasons, including the existence of certain types of resolutions and the ability to compute certain derived functors.

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• 10.

### The representational theory is a mathematical subject that looks to study symmetries in...

• A.

Scalar spaces

• B.

Vector spaces

• C.

Scalar spaces

• D.

B. Vector spaces
Explanation
The representational theory is a mathematical subject that focuses on studying symmetries. In this context, vector spaces are particularly relevant because they provide a mathematical framework for understanding and analyzing transformations and symmetries. Vector spaces allow for the representation of objects and their symmetries through vectors and linear transformations, making them an essential concept in the study of symmetries within the representational theory.

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• Mar 20, 2023
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• Jul 22, 2018
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