## Can a 2×2 matrix be a vector space?

Prove in a similar way that all the other axioms hold, therefore the set of 2 × 2 matrices is a vector space.

**What is the dimension of the vector space of all 2×2 matrices?**

The vector space of 2×2 matrices under addition over a field F is 4 dimensional. It’s span{(1000),(0100),(0010),(0001)}. These are clearly independent under addition.

**What is the set of all 2×2 matrices?**

The set of all 2 x 2 matrices with real entries under componentwise addition is a group. The set of all 2 x 2 matrices with real entries under matrix multiplication is NOT a group.

### Can matrices be a vector space?

So, the set of all matrices of a fixed size forms a vector space. That entitles us to call a matrix a vector, since a matrix is an element of a vector space.

**Can you multiply a 2×2 and 2×2 matrix?**

Multiplication of 2×2 and 2×2 matrices is possible and the result matrix is a 2×2 matrix.

**Do matrices form a vector space?**

## Are 2×2 matrices a field?

As you mentioned, the set of all matrices is not a field. There are many problems with the matrices which keep it far from being a field.

**What is the basis of the vector space of 2×2 matrices?**

But then we are asked to find a basis of the vector space of 2×2 matrices. The excercise says that this basis MUST consist of both symmetric and antisymmetric matrices. I have difficulty in that point. I have found that the basis of 2×2 Matrices space is the standard one { [1 0,0 0], [0 1,0 0], [0 0,1 0], [0 0,0,1]}.

**What is a basis for a vector space?**

A basis for a vector space is by definition a spanning set which is linearly independent. Here the vector space is 2×2 matrices, and we are asked to show that a collection of four specific matrices is a basis:

### Is a collection of four specific matrices a basis?

Here the vector space is 2×2 matrices, and we are asked to show that a collection of four specific matrices is a basis: To be a spanning set means every element of the vector space can be expressed as a linear combination (of finitely many) of elements of the given set.

**What is the dimension of the set of two independent matrices?**

And one can easily show that these 2 matrices are independent and there is no smaller set which spans this space, and hence It’s dimension is 2. The space you are after is a subspace of the above, satisfying a = − b.