1.
What condition will a representation of a group G preserve ω?
Correct Answer
B. W(g.v,gw)=w(v,w)
Explanation
The condition that will preserve ω is W(g.v,gw)=w(v,w). This means that the action of the group G on the vectors v and w, represented by g.v and gw respectively, will result in the same value of ω as the original vectors v and w.
2.
Which indicator is used to identify Symplectic representations?
Correct Answer
A. Frobenius-schur indicator
Explanation
The Frobenius-Schur indicator is used to identify Symplectic representations. It is a mathematical concept that helps determine the type of representation of a group, specifically whether it is self-dual or not. The indicator takes values of 0, 1, or -1, and a value of 1 indicates a symplectic representation. This indicator is important in the study of representation theory and has applications in various areas of mathematics and physics.
3.
Which other representations indicate Symplectic representations?
Correct Answer
C. Quaternionic representations of finite groups
Explanation
Quaternionic representations of finite groups indicate Symplectic representations. This is because quaternionic representations are a special type of representation in which the group elements are represented by quaternion matrices. When these quaternionic representations are applied to finite groups, they can be used to describe and analyze the symmetries and transformations of these groups. Therefore, quaternionic representations of finite groups are a valid indication of Symplectic representations.
4.
When effective or faithful representation is a representation (V , φ), what is the homomorphism φ?
Correct Answer
A. Injective
Explanation
When effective or faithful representation is a representation (V, φ), the homomorphism φ is injective. This means that for every element in the domain of φ, there is a unique element in the codomain that it maps to. In other words, no two distinct elements in the domain are mapped to the same element in the codomain. This ensures that the representation is one-to-one and preserves the structure of the original set.
5.
When V and W are vector spaces over F, equipped with representations φ and ψ of a group G, then what is an equivariant map from V to W?
Correct Answer
B. Linear map
Explanation
An equivariant map from V to W is a linear map that preserves the action of the group G. In other words, for any g in G and v in V, the equivariant map satisfies φ(g)v = ψ(g)F(v), where F is the linear map from V to W. Therefore, the correct answer is "Linear map" because it captures the essential property of preserving the group action.
6.
When α is said to be invertible, what is this called?
Correct Answer
C. Isomorphism
Explanation
When α is said to be invertible, it means that there exists an inverse of α, denoted as α^(-1), such that the composition of α and α^(-1) gives the identity element. This property is called isomorphism. Isomorphism is a concept in mathematics that refers to a structure-preserving mapping between two mathematical objects, where the objects have the same structure and can be considered equivalent in some sense. In this case, α being invertible implies that it has a corresponding inverse that preserves the structure of the original object.
7.
What does the definition of an irreducible representation simple imply?
Correct Answer
B. Schur's lemma
Explanation
The definition of an irreducible representation simple implies Schur's lemma. Schur's lemma states that if a linear operator commutes with all operators in a given irreducible representation, then it must be a scalar multiple of the identity operator. In other words, if an irreducible representation is simple, any operator that commutes with it must be a scalar multiple of the identity. This is a fundamental result in representation theory and is closely related to the concept of irreducibility.
8.
When a representation is the direct sum of two proper nontrivial subrepresentations, what is it said to be?
Correct Answer
C. Decomposable
Explanation
When a representation is the direct sum of two proper nontrivial subrepresentations, it is said to be decomposable.
9.
What do we call the situation when the duality between the circle group S 1 and the integer Z?
The analysis of the...
Correct Answer
A. Theory of Fourier series
Explanation
The duality between the circle group S1 and the integer Z is referred to as the theory of Fourier series. This theory explores the relationship between periodic functions and their Fourier series representations, which involve decomposing a function into a sum of sinusoidal components. The duality between S1 and Z arises from the fact that the group of integers Z can be thought of as the set of frequencies that make up the Fourier series representation of a periodic function on the unit circle.
10.
Which symbol represents Symplectic vector space?
Correct Answer
A. (V,W)
Explanation
The symbol (V,W) represents a symplectic vector space. The convention in mathematics is to use parentheses to denote an ordered pair or tuple, and in this case, it represents a pair of vector spaces V and W. In symplectic geometry, a symplectic vector space is a vector space equipped with a nondegenerate, skew-symmetric bilinear form called a symplectic form. Therefore, the answer (V,W) is the correct representation for a symplectic vector space.