# What Do You Know About Hopf Algebras?

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A Hopf algebra is a bialgebra (unit associative algebra and co-unital associative algebra) that is equipped with an antiautomorphism to satisfy a property. It is one of the mathematical representational theories and it is studied especially with several works on special classes of examples and classification problems. In almost every field in mathematics, Hopf theorem needs to be studied--but with this quiz, you can get an idea of what it's all about.

Questions and Answers
• 1.

### Who was Hopf named after?

• A.

Heinz Hopf

• B.

Lucas Hopf

• C.

Hermes Hopf

• D.

Herman Hopf

Correct Answer
A. Heinz Hopf
Explanation
Hopf was named after Heinz Hopf.

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• 2.

### The representation theory of Hopf algebra allows for construction of the following except one; which one?

• A.

Trivial representations

• B.

Dual representations

• C.

Tensor products of representation

• D.

Bilateral representation

Correct Answer
D. Bilateral representation
Explanation
The representation theory of Hopf algebra allows for the construction of trivial representations, dual representations, and tensor products of representation. However, it does not allow for the construction of bilateral representations. Bilateral representations are not a concept in the representation theory of Hopf algebra.

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• 3.

### What of these do Hopf algebras have NO application in?

• A.

Quantum field theory

• B.

String theory

• C.

Projectiles

• D.

LHC pHenomenology

Correct Answer
C. Projectiles
Explanation
Hopf algebras have no application in the study of projectiles. Hopf algebras are mathematical structures that are used to study symmetry and algebraic structures in various areas of mathematics and theoretical physics. They have found applications in quantum field theory, string theory, and LHC phenomenology, where they help analyze and describe fundamental particles and their interactions. However, projectiles are objects that are typically studied in classical mechanics, which does not require the use of Hopf algebras.

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• 4.

### If the antipode S2 = idH, the Hopf algebra is said to be what?

• A.

Evolutive

• B.

Involutive

• C.

Finite

• D.

Infinite

Correct Answer
B. Involutive
Explanation
If the antipode S2 = idH, it means that the square of the antipode is equal to the identity element of the Hopf algebra. In mathematics, an involution is a function that is its own inverse, meaning that applying the function twice results in the original value. Therefore, if S2 = idH, the Hopf algebra is said to be involution.

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• 5.

### One of the notions of Hopf algebra is that it is an abstraction of properties of which of these?

• A.

Lie algebra

• B.

Boolean algebra

• C.

Fourier algebra

• D.

Group algebra

Correct Answer
D. Group algebra
Explanation
A Hopf algebra is an abstraction of the properties of a group algebra. In a group algebra, elements of a group are used as coefficients in a linear combination of elements. A Hopf algebra extends this concept by introducing additional structures such as comultiplication and antipode, which allow for the study of algebraic and coalgebraic properties simultaneously. Therefore, a group algebra serves as a foundation for understanding the properties of a Hopf algebra.

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• 6.

### What is the unit of Hopf algebras?

• A.

Single elements

• B.

Multi-elements

• C.

Poly elements

• D.

Group-like elements

Correct Answer
D. Group-like elements
Explanation
Group-like elements are the unit of Hopf algebras. In Hopf algebra theory, group-like elements play a fundamental role. These elements are analogous to the identity element in a group, as they satisfy certain properties that resemble the properties of the identity element. Group-like elements are important because they allow for the definition of a comultiplication operation in Hopf algebras, which is a key structure that distinguishes them from other types of algebras. Therefore, the unit of Hopf algebras is the group-like elements.

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• 7.

### A group-like element is a _______ element.

• A.

Non-zero

• B.

Zero

• C.

Prime

• D.

Linear

Correct Answer
A. Non-zero
Explanation
A group-like element refers to an element that possesses certain properties similar to those of a group. In this context, a non-zero element is considered a group-like element. This is because a group requires an identity element, and the identity element cannot be zero. Therefore, the correct answer is non-zero.

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• 8.

### A finite groupoid algebra is categorized as what? A...

• A.

Weak Hopf algebra

• B.

Strong Hopf algebra

• C.

Dual Hopf algebra

• D.

Group Hopf algebra

Correct Answer
A. Weak Hopf algebra
Explanation
A finite groupoid algebra is categorized as a Weak Hopf algebra because it possesses some, but not all, of the properties of a Hopf algebra. While it has a comultiplication and counit, it may not have an antipode. This means that it lacks the full symmetry and invertibility properties of a Strong Hopf algebra. Therefore, it is classified as a Weak Hopf algebra.

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• 9.

### If G is taken to be a set instead of a module, the field K will be replaced by what? A/an...

• A.

3-point set

• B.

2-point set

• C.

1-point set

• D.

0-point set

Correct Answer
C. 1-point set
Explanation
If G is taken to be a set instead of a module, the field K will be replaced by a 1-point set. This is because a module is a generalization of a vector space, where the field acts as the scalar set. However, when G is considered as a set, it does not have any additional structure, so the field K is replaced by a 1-point set, indicating that there is only one element in the set.

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• 10.

### What is the property defined by E: H -> R?

• A.

Co-commutative

• B.

Co-additive

• C.

Comultiplication

• D.

Commutative

Correct Answer
C. Comultiplication
Explanation
Comultiplication is the property defined by E: H -> R. Comultiplication is a concept in mathematics and algebraic structures, specifically in the field of coalgebras. It is an operation that takes an element from a coalgebra and produces multiple copies of it. In other words, it is a way of duplicating or multiplying elements in a coalgebra. Therefore, the correct answer is Comultiplication.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Jul 22, 2018
Quiz Created by
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