Linear Maps: Kernel, Range, and the Rank Nullity Theorem

Learning Objectives

By the end of this lesson, students should be able to:

Define a linear map and identify its domain and codomain.

Determine the kernel of a linear transformation.

Determine the range of a linear transformation.

Explain why the kernel and range are vector subspaces.

Calculate the rank and nullity of a linear transformation.

Apply the Rank–Nullity Theorem to analyze the dimensions of vector spaces.

Introductory lesson slide about linear transformations and their properties.
Additional notes introducing linear maps, domain, and codomain.

The Domain of T

Mathematical notes explaining the domain of a linear transformation T.

The Codomain of T

Mathematical notes explaining the codomain of a linear transformation T.

The Kernel of T

Mathematical notes defining the kernel of a linear transformation T.

The Nullity of T

Mathematical notes introducing nullity, the dimension of the kernel of T.
Additional mathematical notes about the nullity of a linear map.

The Range of T

Mathematical notes defining the range, or image, of a linear transformation T.
Additional mathematical notes about the range of a linear transformation.

The Rank of T

Mathematical notes introducing rank, the dimension of the range of T.

Illustration

Illustration of a linear map and its related vector spaces.
Diagram illustrating a linear transformation and its domain, codomain, kernel, or range.

The Rank-Nullity Theorem

Mathematical slide stating the Rank–Nullity Theorem for a linear transformation.
Additional explanation of the relationship between the dimensions of the domain, kernel, and range.

Example 1

First worked example applying the concepts of linear maps, kernel, range, rank, or nullity.
Continuation of the first worked example about linear maps.

Example 2

Second worked example involving linear transformations and their dimensions.
Continuation of the second worked example about linear maps.

Example 3

Third worked example involving linear transformations, rank, and nullity.

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