## Do the rationals form a vector space?

Hence, the set of all rational numbers is not a vector space over R.

### Is the set of all integers a real vector space?

(a) The set of all integers. This set will not form a vector space because it is not closed under scalar multiplication. When, the scalar, which can take any value, is multiplied by the integer, the resulting number may be a real number or rational number or irrational number or integer.

#### Can integers be a vector space?

Rn, for any positive integer n, is a vector space over R: For example, the sum of two lists of 5 numbers is another list of 5 numbers; and a scalar multiple of a list of 5 numbers is another list of 5 numbers.

What is a real vector space?

A real vector space is a vector space whose field of scalars is the field of reals. A linear transformation between real vector spaces is given by a matrix with real entries (i.e., a real matrix). SEE ALSO: Complex Vector Space, Linear Transformation, Real Normed Algebra, Vector Basis, Vector Space.

Why Q R is not vector space?

R is a Vector-space over the set of rationals Q . Because every field can be regarded as a Vector- space over itself or a sub – field of itself. Of course it is an infinite- dimensional space ( uncountable, with cardinality equal to the cardinality of the set of all sequences with range { 0, 1 } ) .

## Why Q is not a vector space over R?

Hence R cannot have finite dimension as a vector space over Q. That is, R has infinite dimension as a vector space over Q. But this is impossible: Qn is countable and R is uncountable and so there cannot be a bijection between these sets. We conclude that R must have infinite dimension as a vector space over Q.

### Which set is not a vector space?

Most sets of n-vectors are not vector spaces. P:={(ab)|a,b≥0} is not a vector space because the set fails (⋅i) since (11)∈P but −2(11)=(−2−2)∉P. Sets of functions other than those of the form ℜS should be carefully checked for compliance with the definition of a vector space.

#### Which is not a vector space?

A vector space needs to contain →0. Similarily, a vector space needs to allow any scalar multiplication, including negative scalings, so the first quadrant of the plane (even including the coordinate axes and the origin) is not a vector space.

What is the use of vector space in real life?

Vector spaces have many applications as they occur frequently in common circumstances, namely wherever functions with values in some field are involved. They provide a framework to deal with analytical and geometrical problems, or are used in the Fourier transform.

Is the unit circle a vector space?

Example 2. The unit circle, denoted U, in R2 is not a vector space.

## What is the difference between vector and vector space?

A vector is a member of a vector space. A vector space is a set of objects which can be multiplied by regular numbers and added together via some rules called the vector space axioms.

### Is C NA vector space?

(i) Yes, C is a vector space over R. Since every complex number is uniquely expressible in the form a + bi with a, b ∈ R we see that (1, i) is a basis for C over R. Thus the dimension is two. (ii) Every field is always a 1-dimensional vector space over itself.

#### Can a field of rationals be made a vector space?

As field of reals R can be made a vector space over field of complex numbers C but not in the usual way. In the same way can we make the ring of integers Z as a vector space the field of rationals Q? It is clear if it forms a vector space, then dimQZ will be finite. Now i am stuck. Please help me. Thanks in advance.

How are vector spaces related to real numbers?

Vector spaces over the ﬁeld of real numbers are usually referred to as real vector spaces. (A real vector space is thus characterized by two operations: an operation in which two elements of the vector space are added together, and an operation in which elements of the vector space are multiplied by real numbers.)

What makes a vector space a complex vector space?

(A real vector space is thus characterized by two operations: an operation in which two elements of the vector space are added together, and an operation in which elements of the vector space are multiplied by real numbers.) Similarly vector spaces over the ﬁeld of complex numbers are referred to as complex vector spaces.

## Which is an algebraic operation of a vector space?

A vector space over some ﬁeld K is an algebraic structure consisting of a set V on which are deﬁned two algebraic operations: a binary operation referred to as addition, and an operation of multiplication by scalars in which elements of the vector space are multiplied by elements of the given ﬁeld K.