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## What is the basis of a row space?

The nonzero rows of a matrix in reduced row echelon form are clearly independent and therefore will always form a basis for the row space of A. Thus the dimension of the row space of A is the **number of leading 1’s in rref(A)**. Theorem: The row space of A is equal to the row space of rref(A).

## What is the dimension of the null space?

The dimension of the Null Space of a matrix is called the ”nullity” of the matrix. **f(rx + sy) = rf(x) + sf(y)**, for all x,y ∈ V and r,s ∈ R. fA :Rm −→Rn which is given by: fA(x) = Ax, for x ∈ Rm .

## Is the null space a subspace of the column space?

The column space of the matrix in our example was a subspace of R4. The nullspace of A is a subspace of **R3**.

## Do row operations change the column space?

**Elementary row operations affect the column space**. So, generally, a matrix and its echelon form have different column spaces. However, since the row operations preserve the linear relations between columns, the columns of an echelon form and the original columns obey the same relations.

## What is the null space?

: a subspace of a vector space consisting of vectors that under a given linear transformation are mapped **onto zero**.

## How do you find the basis of the null space in Matlab?

Description. **Z = null( A )** returns a list of vectors that form the basis for the null space of a matrix A . The product A*Z is zero. size(Z, 2) is the nullity of A .

## What is the basis of the zero vector space?

A basis of the zero vector space is **the empty set**.