Infinite Dimensional Vector Space

In summary, an infinite dimensional vector space is a collection of objects that can be added and multiplied together. It has infinite basis vectors and some properties such as vector addition and scalar multiplication. It differs from finite dimensional vector spaces in the number of basis vectors. Examples of infinite dimensional vector spaces include function spaces and sequence spaces. These spaces are important in science as they allow for the modeling and solving of problems involving an infinite number of variables and have applications in various areas of mathematics.
  • #1
Bachelier
376
0
Can you guys provide a counter example of why this statement is False.

If T: V-->V with V a VS over C then T has an eigenvector?

This is not always true as if V is infinite dim., it'll have a Spectrum.

Any counter examples?

Thanks
 
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  • #2
The standard example is the bilateral shift on [itex]\ell(\mathbb{Z})[/itex]:

[tex]T:\ell(\mathbb{Z})\to \ell(\mathbb{Z})[/tex]
[tex](a_i)_{i\in\mathbb{Z}}\mapsto (a_{i+1})_{i\in\mathbb{Z}}.[/tex]
 

1. What is an infinite dimensional vector space?

An infinite dimensional vector space is a mathematical concept that describes a collection of objects (vectors) that can be added and multiplied together. Unlike finite dimensional vector spaces, which have a finite number of basis vectors, infinite dimensional vector spaces have an infinite number of basis vectors.

2. What are the properties of an infinite dimensional vector space?

Some properties of an infinite dimensional vector space include the ability to add and multiply vectors, as well as scalar multiplication and distributivity. Additionally, infinite dimensional vector spaces have a zero vector and additive inverses for each vector.

3. How is an infinite dimensional vector space different from a finite dimensional vector space?

The main difference between an infinite dimensional vector space and a finite dimensional vector space is the number of basis vectors. In a finite dimensional vector space, there is a finite number of basis vectors, while in an infinite dimensional vector space, there is an infinite number of basis vectors.

4. What are some examples of infinite dimensional vector spaces?

Some examples of infinite dimensional vector spaces include function spaces, such as the space of all continuous functions on a closed interval, and sequence spaces, such as the space of all real sequences.

5. Why are infinite dimensional vector spaces important in science?

Infinite dimensional vector spaces are important in science because they provide a way to model and solve problems that involve an infinite number of variables or dimensions. They are also used in many areas of mathematics, such as functional analysis and differential equations, which have numerous applications in science.

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