This article is part of the article series "MIT Linear Algebra."
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MIT Introduction to Linear Algebra

This is the sixth post in an article series about MIT's course "Linear Algebra". In this post I will review lecture six on column spaces and null spaces of matrices. The lecture first reviews vector spaces and subspaces and then looks at the result of intersect and union of vector subspaces, and finds out when Ax=b and Ax=0 can be solved.

Here is a list of the previous posts in this article series:

Lecture 6: Column Space and Null Space

Lecture six starts with a reminder of what the vector space requirements are. If vectors v and w are in the space, then the result of adding them and multiplying them by a number stays in the space. In other words, all linear combinations of v and w stay in the space.

For example, the 3-dimensional space R3 is a vector space. You can take any two vectors in it, add them, and multiply them by a number and they will still be in the same R3 space.

Next, the lecture reminds subspaces. A subspace of some space is a set of vectors (including the 0 vector) that satisfies the same two requirements. If vectors v and w are in the subspace, then all linear combinations of v and w are in the subspace.

For example, some subspaces of R3 are:

  • Any plane P through the origin (0, 0, 0).
  • Any line L through the origin (0, 0, 0).

See the previous, lecture 5, on more examples of spaces on subspaces.

Now suppose we have two subspaces of R3 - plane P and line L. Is the union P∪L a subspace? No. Because if we take some vector in P and some vector in L and add them together, we go outside of P and L and that does not satisfy the requirements of a subspace.

What about intersection P∩L? Is P∩L a subspace? Yes. Because it's either the zero vector or L.

In general, given two subspaces S and T, union S∪T is a not a subspace and intersection S∩T is a subspace.

The lecture now turns to column spaces of matrices. The notation for a column space of a matrix A is C(A).

For example, given this matrix,

Matrix A

The column space C(A) is all the linear combination of the first (1, 2, 3, 4), the second (1, 1, 1, 1) and the third column (2, 3, 4, 5). That is, C(A) = { a·(1, 2, 3, 4) + b·(1, 1, 1, 1) + c·(2, 3, 4, 5) }. In general, the column space C(A) contains all the linear combinations of columns of A.

A thing to note here is that C(A) is a subspace of R4 because the vectors contain 4 components.

Now the key question, does C(A) fill the whole R4? No. Because there are only three columns (to fill the whole R4 we would need exactly 4 columns) and also because the third column (2, 3, 4, 5) is a sum of first column (1, 2, 3, 4) and second column (1, 1, 1, 1).

From this question follows another question, the most important question in the lecture - Does Ax=b have a solution for every right-hand side vector b? No. Because the columns are not linearly independent (the third can be expressed as first+second)! Therefore the column space C(A) is actually a two-dimensional subspace of R4.

Another important question arises - For which right-hand sides b can this system be solved? The answer is: Ax=b can be solved if and only if b is in the column space C(A)! It's because Ax is a combination of columns of A. If b is not in this combination, then there is simply no way we can express it as a combination.

That's why we are interested in column spaces of matrices. They show when can systems of equation Ax=b be solved.

Now the lecture turns to null spaces of matrices. The notation for a null space of a matrix A is N(A).

Let's keep the same matrix A:

Matrix A

The null space N(A) contains something completely different than C(N). N(A) contains all solutions x's that solve Ax=0. In this example, N(A) is a subspace of R3.

Let's find the null space of A. We need to find all x's that solve Ax=0. The first one, obviously, is x = (0, 0, 0). Another one is x = (1, 1, -1). In general all x's (c, c, -c) solve Ax=0. The vector (c, c, -c) can be rewritten as c·(1, 1, -1).

Note that the null space c·(1, 1, -1) is a line in R3.

The lecture ends with a proof that solutions x to Ax=0 always give a subspace. The first thing to show in the proof is that if x is a solution and x' is a solution, then their sum x + x' is a solution:

We need to show that if Ax=0 and Ax' = 0 then A(x + x') = 0. This is very simple. Matrix multiplication allows to separate A(x + x') into Ax + Ax' = 0. But Ax=0 and Ax'=0. Therefore 0 + 0 = 0.

The second thing to show is that if x is a solution, then c·x is a solution:

We need to show that if Ax=0 then A(c·x)=0. This is again very simple. Matrix multiplication allows to bring c from A(c·x) outside c·A(x) = c·0 = 0.

That's it. We have proven that solutions x to Ax=0 always form a subspace.

Here is the video of the sixth lecture:

Topics covered in lecture six:

  • [01:00] Vector space requirements.
  • [02:10] Example of spaces R3.
  • [02:40] Subspaces of spaces.
  • [03:00] A plane P is a subspace of R3.
  • [03:50] A line L is a subspace of R3.
  • [04:40] Union of P and L.
  • [07:30] Intersection of P and L.
  • [09:00] Intersection of two subspaces S and T.
  • [11:50] The column space C(A) of a matrix A.
  • [16:20] Does Ax=b have a solution for every b?
  • [19:45] Which b's allow Ax=b to be solved?
  • [23:50] Can solve Ax=b exactly when b is in C(A).
  • [28:50] The null space N(A) of a matrix A.
  • [37:00] Why is the null space a vector space?
  • [37:30] A proof that the null space is always a vector space.
  • [41:50] Do the solutions to Ax=b form a subspace?

Here are my notes of lecture six:

MIT Linear Algebra, Lecture 6: Column Space and Null Space
My notes of linear algebra lecture 6 on column space and null space.

Have fun with this lecture! The next post is going to be about general theory of solving equations Ax=0, pivot variables and special solutions.

PS. This course is taught from Introduction to Linear Algebra textbook. Get it here:

This article is part of the article series "MIT Linear Algebra."
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Comments

Sharkey Permalink
February 24, 2010, 14:03

Just a quick comment: in your column space example, the 3rd column isn't a multiple of the first; rather, it's a result of the addition of the first and the second: (1,2,3,4) + (1,1,1,1) = (2,3,4,5).

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February 24, 2010, 15:49

Sharkey, oh right, it's a linear combination of first two. Going to correct it in the article shortly. Thanks for catching that.

yatsek Permalink
February 24, 2010, 16:09

Also (in space example) first argument should be that there is no way C(A) could fill the whole R⁴ because A consists only of 3 vectors - and after that it's valid to add Sharkeys comment that only 2 are linearly independent.

Nevertheless great lecture of course.

February 24, 2010, 17:30

yatsek, good argument, it would need 4 vectors.

I have now updated the post with this argument and fixed the mistake Sharkey found.

February 25, 2010, 07:37

good post

Aizen Permalink
March 10, 2010, 17:02

you are really well-documented person..
really, i enjoyed every post you write about math & algorithms

Aizen Permalink
March 10, 2010, 17:20

hmm one thing, thanks for MIT stuff, i really like that, hope i can go to MIT..hehe :D

Developer Permalink
April 09, 2010, 18:34

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g barlow Permalink
April 29, 2010, 14:32

Thank you for these notes. I thought I was doing OK, until the middle of lecture six. "...I'm ready for chapter three. ...vector spaces...we really have to start now and think...". For lectures six, seven, and perhaps the rest of the course I think I'm going to need all the help I can get. Please keep posting. I hope I bookmarked you correctly. Thanks again.

g barlow Permalink
April 29, 2010, 14:43
<Sorry>

(Correction: strike 'middle of lecture six', insert 'middle of lecture five.')-gb
Thank you for these notes. I thought I was doing OK, until the middle of lecture six. "...I'm ready for chapter three. ...vector spaces...we really have to start now and think...". For lectures six, seven, and perhaps the rest of the course I think I'm going to need all the help I can get. Please keep posting. I hope I bookmarked you correctly. Thanks again.

Ken Permalink
June 25, 2011, 17:04

Your linear algebra notes are useful and interesting, especially with the graphs, notes, etc. But you seemed to have stopped at lecture 6. Will you continue to update on this series of posts on your blog?

Thanks! :)

June 26, 2011, 14:17

Yes, I will, but I am not sure when. It takes 2 days to write about 1 lecture.

Ken Permalink
June 26, 2011, 20:11

yea I totally understand. Glad to hear that this series of lecture notes is not totally forgotten. Don't worry, take your time. Your other posts are interesting too. I am sure many others out there, like me, will look forward to your new posts on the lectures. Thanks Peter! :)

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June 03, 2014, 20:20

good argument, it would need 4 vectors

faheen Permalink
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sanchit Permalink
August 06, 2014, 20:08

I really liked your blog very much. It was really great to visit here. I found many interesting things. Well today I will discuss about happy independence day 2014. In india Independence day is celebrated with great zeal and enthusiasm and much respect is given to national song and national anthem. If you are one of those who want to listen to great independence day songs then I have few great for you. Just look at it

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August 09, 2014, 22:12

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sanchit Permalink
August 11, 2014, 18:07

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August 12, 2014, 11:47

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August 29, 2014, 12:13

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August 29, 2014, 17:42

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sanchit Permalink
September 21, 2014, 11:27

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