# What Do You Know About Auslander—reiten Theory?

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When we reunite broken parts (i. E. In algebra), the Auslander–Reiten theory becomes a very useful theory, which —
thanks to specific techniques — studies the representation theory of Artinian rings.
These techniques include Auslander–Reiten quivers, Auslander–Reiten sequences, and almost split sequences.
And as the name implies, mathematicians Reiten and Auslander introduced it in the 20th century.

• 1.

### When was Auslander–Reiten theory introduced?

• A.

1975

• B.

1976

• C.

1977

• D.

1978

A. 1975
Explanation
Auslander-Reiten theory was introduced in 1975.

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• 2.

### What does the theory determine?

• A.

Representation theory of Artinian rings

• B.

Auslander theory of Artinian rings

• C.

Independent theory of Artinian rings

• D.

Artinian rings

A. Representation theory of Artinian rings
Explanation
The theory being referred to in the given question is the representation theory of Artinian rings. This theory focuses on the study of how elements of Artinian rings can be represented as linear transformations on vector spaces. It explores the relationship between the algebraic structure of Artinian rings and their corresponding linear transformations, providing insights into the behavior and properties of these rings.

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• 3.

### What is another name for Auslander—Reiten sequence?

• A.

Almost split sequence

• B.

Split sequence

• C.

Sectional sequence

• D.

Total sequence

A. Almost split sequence
Explanation
The correct answer is "Almost split sequence." The Auslander-Reiten sequence is also known as the almost split sequence. This sequence is a fundamental tool in the study of representation theory and homological algebra. It provides important information about the structure and properties of modules over certain algebraic structures, such as rings or algebras. The almost split sequence helps to understand the relationships between different modules and their homological properties, making it a crucial concept in these areas of mathematics.

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• 4.

### Which duo introduced the theory?

• A.

Maurice Auslander and Idun Reiten

• B.

Idun Auslander and Maurice Reiten

• C.

Leo Auslander and Idun Reiten

• D.

Maurice Auslander and Charles Reiten

A. Maurice Auslander and Idun Reiten
Explanation
Maurice Auslander and Idun Reiten introduced the theory.

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• 5.

### What is the English expression of τ = D Tr?

• A.

Transition

• B.

Transmission

• C.

Translation

• D.

Transpose

A. Transition
Explanation
The English expression of τ = D Tr is "Transition". In mathematics, τ represents a transition matrix, D represents a diagonal matrix, and Tr represents the trace of a matrix. Therefore, the equation can be read as "Transition matrix equals the product of a diagonal matrix and the trace of a matrix".

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• 6.

### In τ = D Tr, what is D?

• A.

Diameter

• B.

Dual

• C.

Density

• D.

Distance

B. Dual
Explanation
In the equation τ = D Tr, the variable D represents the concept of "dual". The equation suggests that the value of τ is equal to D multiplied by Tr. Therefore, D is the coefficient or factor associated with the concept of "dual" in this equation.

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• 7.

### What is Tr equal to?

• A.

Transition

• B.

Transpose

• C.

Transmission

• D.

Translation

B. Transpose
Explanation
The correct answer is "Transpose." Transpose refers to the operation of interchanging rows and columns in a matrix. It is commonly used in linear algebra and mathematics to manipulate matrices and solve equations.

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• 8.

### Which of these is a property of Auslander—Reiten sequence?

• A.

The sequence is split

• B.

The sequence is not split

• C.

The sequence is almost split

• D.

The sequence remains in the same form

B. The sequence is not split
Explanation
The property of Auslander-Reiten sequence being "not split" means that the sequence does not have a direct summand that is isomorphic to the original module. In other words, the sequence cannot be decomposed into simpler modules that are isomorphic to the original module. This property is important in the study of representation theory and module theory, as it provides information about the structure and behavior of modules.

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• 9.

### Which ring is used to determine the theory?

• A.

Artic ring

• B.

Artinian ring

• C.

Attic ring

• D.

Indecompossable ring

B. Artinian ring
Explanation
The correct answer is Artinian ring. An Artinian ring is a ring in which every descending chain of ideals stabilizes, meaning that there are no infinitely descending chains of ideals. This property is important in the study of ring theory as it allows for the development of various results and theorems. The other options (Artic ring, Attic ring, and Indecompossable ring) are not commonly used terms in ring theory and do not have the same significance as the Artinian ring.

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• 10.

### In the theory, what does k represent?

• A.

Field

• B.

Kelvin value

• C.

Valency

• D.

Velocity

A. Field
Explanation
In the theory, k represents the field.

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