Span of an infinite set. Exam Question.

However, V is finite dimensional because it can be spanned by the two unit vectors.In summary, if V is defined as the set of integers and every pair of distinct elements in V is linearly independent, it is not possible for V to be finite dimensional. This is because a basis for the space would require an infinite number of linearly independent vectors, which is not possible. However, if V is defined as the set of unit vectors in the first quadrant of a two dimensional plane, then V is finite dimensional because it can be spanned by only two unit vectors.
  • #1
heshbon
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0

Homework Statement



Suppose V=<Z> where Z is an infinite set, So Z spans V.
Suppose that every pair of distinct elements of Z is linearly independent.
Is it possible that V is finite dimensional? Justify your answer.

Homework Equations





The Attempt at a Solution


All the vectors must be linearly independent if any two are so...
I don't think you can as a basis for the space would have infinite linaerly independent vectors.
 
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  • #2
All of the vectors don't have to be linearly independent just because every pair is. Let Z be the set of all unit vectors in the first quadrant in the two dimensional plane. Since they all point in different directions, any pair is linearly independent.
 

Related to Span of an infinite set. Exam Question.

1. What is a span of an infinite set?

The span of an infinite set is the set of all possible linear combinations of the elements in the set. In other words, it is the set of all possible combinations of the vectors in the set.

2. How is the span of an infinite set different from a finite set?

A finite set has a limited number of elements, and therefore a limited number of possible linear combinations. In contrast, an infinite set has an infinite number of elements and an infinite number of possible linear combinations.

3. Why is the span of an infinite set important in mathematics?

The span of an infinite set is important because it allows us to understand the properties and relationships of the elements in the set. It also helps us to solve complex mathematical problems and prove theorems.

4. Can the span of an infinite set be described in geometric terms?

Yes, the span of an infinite set can be visualized as a vector space in which the elements of the set are represented by vectors. The span is then the set of all possible linear combinations of these vectors, which can be visualized as a geometric shape in the vector space.

5. How can the span of an infinite set be calculated or determined?

The span of an infinite set can be calculated by finding a basis for the set, which is a set of linearly independent vectors that can be used to represent all other vectors in the set. The span is then the set of all possible linear combinations of the basis vectors.

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