What is the invariant real structure also termed as?

Control of vehicles flying through air

What is the descriptive feature of a Hermitian form?

Representation changes to a nondegenerate invariant sesquilinear form

Representation changes to a degenerate invariant linear form

Representation changes to the linear form

Representation changes to the sesquilinear form

What Do You Know About Real Representations?

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Quizzes Created: 129 | Total Attempts: 40,677

Questions: 10 | Attempts: 127 | Updated: Mar 20, 2023

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What Do You Know About Real Representations? - Quiz

In mathematics--especially when considering the field of representation theory on a vector space represented by an invariant real structure, real representations are very useful. If you are willing to learn more about this theorem or get more information associated with it, consider this quiz and ensure that you practice the questions.

Questions and Answers

1.

How do we represent real vector space?
- A.
  
  V
- B.
  
  U
- C.
  
  S
- D.
  
  R
Correct Answer
B. U

Explanation
In mathematics, a real vector space is represented by the symbol U.

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2.

How do we represent complex vector space?
- A.
  
  V
- B.
  
  U
- C.
  
  S
- D.
  
  R
Correct Answer
A. V

Explanation
Complex vector spaces are represented by the symbol V. This is because V is commonly used to denote a vector space in mathematics, and the addition of complex numbers to the vector space is indicated by the use of the symbol C. Therefore, the combination of V and C represents a complex vector space.

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3.

What is the invariant real structure also termed as?
- A.
  
  Antilinear equivariant map
- B.
  
  Linear equivariant map
- C.
  
  Stability
- D.
  
  Control of vehicles flying through air
Correct Answer
A. Antilinear equivariant map

Explanation
The invariant real structure is also known as an antilinear equivariant map. This term refers to a mapping that preserves the real structure of a mathematical object while also respecting certain symmetry properties. In this context, the term "antilinear" indicates that the map preserves the complex conjugation operation, while "equivariant" means that it respects the symmetries of the object being mapped. Overall, this term is used to describe a specific type of mapping that has both antilinear and equivariant properties.

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4.

In the subject of physics, representations are viewed as what?
- A.
  
  Matrices
- B.
  
  Momentum
- C.
  
  Inertia
- D.
  
  Space
Correct Answer
A. Matrices

Explanation
In the subject of physics, representations are viewed as matrices. Matrices are mathematical structures that are used to represent physical quantities and relationships between them. In physics, matrices are commonly used to represent transformations, such as rotations or translations, as well as to describe the behavior of physical systems. They allow physicists to analyze and manipulate complex physical phenomena using mathematical tools. Therefore, matrices are an important tool in the study and understanding of physics.

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5.

What happens to the direct sum of quaternionic and real representation?
- A.
  
  Real
- B.
  
  Neither real nor quaternionic
- C.
  
  Both real and quaternionic
- D.
  
  Quaternionic
Correct Answer
B. Neither real nor quaternionic

Explanation
When we take the direct sum of a quaternionic representation and a real representation, the resulting representation is neither purely real nor purely quaternionic. The direct sum combines the two representations into a single representation where each element is a pair consisting of a quaternionic element and a real element. Thus, the resulting representation contains both quaternionic and real components.

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6.

A representation on a complex vector space is isomorphic to what?
- A.
  
  Dual representation
- B.
  
  Single representation
- C.
  
  Complete representation
- D.
  
  Multiple representation
Correct Answer
A. Dual representation

Explanation
A representation on a complex vector space is isomorphic to the dual representation because the dual representation is the set of all linear transformations from the original representation to the complex numbers. This means that the dual representation captures all the information and structure of the original representation, making it isomorphic to the complex vector space.

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7.

What is the descriptive feature of a Hermitian form?
- A.
  
  Representation changes to a degenerate invariant linear form
- B.
  
  Representation changes to a nondegenerate invariant sesquilinear form
- C.
  
  Representation changes to the linear form
- D.
  
  Representation changes to the sesquilinear form
Correct Answer
B. Representation changes to a nondegenerate invariant sesquilinear form

Explanation
A Hermitian form is a complex-valued bilinear form that satisfies a certain symmetry property. The descriptive feature of a Hermitian form is that its representation changes to a nondegenerate invariant sesquilinear form. This means that the form remains bilinear and satisfies certain symmetry conditions, but it is also nondegenerate, meaning that it has no nontrivial null vectors. Additionally, the form is invariant under certain transformations, meaning that it remains unchanged when the underlying vector space is transformed.

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8.

The representation of a Hermitian form is also referred to as what?
- A.
  
  Pseudo hermitian
- B.
  
  Real hermitian
- C.
  
  Universal hermitian
- D.
  
  Concurrent hermitian
Correct Answer
A. Pseudo hermitian

Explanation
A Hermitian form is a complex-valued function that satisfies certain properties. The representation of a Hermitian form that is referred to as "pseudo hermitian" means that it possesses similar properties to a Hermitian form but may not satisfy all of them. This term is used to describe a generalized or approximate version of a Hermitian form.

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9.

The representation of symmetric groups are...
- A.
  
  Irrational
- B.
  
  Real
- C.
  
  Complex
- D.
  
  Rational
Correct Answer
B. Real

Explanation
The representation of symmetric groups can be classified as real because the elements of these groups can be represented by real numbers. Unlike complex numbers, which have both real and imaginary parts, the representations of symmetric groups only involve real values. This classification is important in the study of group theory and helps understand the properties and behavior of symmetric groups.

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10.

The representation of rotational groups are...
- A.
  
  Complex
- B.
  
  Rational
- C.
  
  Irrational
- D.
  
  Real
Correct Answer
D. Real

Explanation
The representation of rotational groups can be described as real. This is because the elements of a rotational group can be represented by real numbers, such as angles or coordinates in three-dimensional space. Unlike complex, rational, or irrational numbers, which may not accurately represent the rotational transformations, real numbers provide a suitable and practical representation for rotational groups.

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