Nullspace Definition and 59 Threads

In mathematics, the kernel of a linear map, also known as the null space or nullspace, is the linear subspace of the domain of the map which is mapped to the zero vector. That is, given a linear map L : V → W between two vector spaces V and W, the kernel of L is the vector space of all elements v of V such that L(v) = 0, where 0 denotes the zero vector in W, or more symbolically:




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{\displaystyle \ker(L)=\left\{\mathbf {v} \in V\mid L(\mathbf {v} )=\mathbf {0} \right\}.}

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  1. C

    Finding orthogonal basis for the nullspace of a matrix?

    Homework Statement Find an orthogonal basis for the nullspace of the matrix [2 -2 14] [0 3 -7] [0 0 2] Homework Equations The Attempt at a Solution The nullspace is x = [0, 0, 0], so what is the orthogonal basis? It can be anything can't it?
  2. D

    Prove Null(AB) ≥ Null(B): Invertible Cases

    Hey. I am doing some last minute exam study and came across this question: let A and B be nxn matrices. Prove that Null(AB) \geq Null(B) Now i think i did it correctly, but i wasn't sure if i perhaps overlooked something and there is a flaw in my proof. I began by stating that if any...
  3. E

    Dimensionality, Rangespace & Nullspace Problem

    [SOLVED] Dimensionality, Rangespace & Nullspace Problem Homework Statement Prove (where A is an n x n matrix and so defines a transformation of any n-dimensional space V with respect to B, B where B is a basis of V) that \dim(R(A) \cap N(A)) = \dim R(A) - \dim R(A^2) The attempt at a...
  4. M

    Am i setting up equations right? Matrices, finding nullspace

    Hello everyone I'm confused if I'm setting these equations up right: i have: 1 0 1 0 1 -2 0 0 0 so i said: x + z = 0; y - 2z = 0; z = ? because its a whole row of 0's, so u have no info about what z could be so i said let z = a; x + a = 0; y -2a = 0; z = a; x = a; y = 2a; z = a; so let a =...
  5. M

    Finding the basis of the nullspace, can you see if i'm doing this right?

    Hello everyone, I think i did this right, but i want to make sure this is what they want. The questions says: In each case find a basis for and caclulate the dimension of nullA: Here is my work and problem! http://img207.imageshack.us/img207/2948/lastscan6ib.jpg I just found out its...
  6. M

    Can't Row Reduce Matrix - Finding Nullspace and Imagespace

    Hello everyone... I have the following matrix: A = -1 -4 1 7 -9 0 10 3 -3 -9 1 2 I can't row reduce this sucker! This isn't an agumented matrix i don't think, so i can't just take the square matrix and then find the inverse and mutliply it by vector b to find the values of a, b, c, d; So...
  7. E

    Nullspace of non-zero 4x4 matrix

    Hello everyone, it's final's time next week :cry: , so I will be posting here more often than usual :biggrin: Here is one problem I came across when doing review: The nullspace of non-zero 4x4 matrix cannot contain a set of 4 lin. indep. vectors. (T/F) The way I was thinking is that...
  8. F

    (LINALG) : Nullspace of transpose : N(A^T)

    I'm not sure if I am making a mistake, or my book is wrong, or if both answers are correct. But, it is confusing me, and I would like to know why. We are asked to find the basis of the following subspaces on the matrix A. Find: R(A^T),\,\,N(A),\,\,\,R(A),\,\,N(A^T) I'm having trouble...
  9. B

    Nullspace and Column Space Question

    Nullspace and Orthogonal Complement Quick question: is the nullspace the orthogonal complement of the column space or the the row space? Thanks, sorry I don't have my textbook nearby.
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