Recent content by mikael27

  1. M

    General Solution-Three variables-Two Equations

    Homework Statement Find the general solution of the following set of equations: u − w + y = 1 u + w + 2y = 0 Homework Equations The Attempt at a Solution I know that the solution is in this form (u,w,y)= (a,b,c) + k*(d,e,f) Can you please explain me how i am going to find it?
  2. M

    Projecting to the range of a matrix

    can anyone help ?
  3. M

    Projecting to the range of a matrix

    Homework Statement Let U = span({(1, 2, 1)t, (1, 0, 0)t}) and V = span({(0, 1, 1)t}) be subspaces of R3. Find the matrix B representing the projection onto V parallel to U. Homework Equations The Attempt at a Solution If a matrix C with range U and and a matrix D whose...
  4. M

    Power set P(S) with symmetry difference.

    infinity order
  5. M

    Power set P(S) with symmetry difference.

    i don't know
  6. M

    Power set P(S) with symmetry difference.

    so A^2=empty set. no elements from -infinity to + infinity
  7. M

    Power set P(S) with symmetry difference.

    yes i know that that's why i told you 0. There are no elements left {1,2,3,4}-{5,4,2,7} 1,3 {1,2,3,4}-{1,2,3,4} no elements
  8. M

    Power set P(S) with symmetry difference.

    can you please explain me
  9. M

    Power set P(S) with symmetry difference.

    it says that the A-A union A-A. On sets if A-A=0 it means it is zero
  10. M

    Power set P(S) with symmetry difference.

    just A and A ?
  11. M

    Power set P(S) with symmetry difference.

    Its A^2
  12. M

    Power set P(S) with symmetry difference.

    To the answer is that we have one element A and the order of A is k?
  13. M

    Power set P(S) with symmetry difference.

    I also know that AΔB = (A-B) U (B - A)= (B-A) U (A - B)=BΔA
  14. M

    Power set P(S) with symmetry difference.

    the identity is the empty set.
  15. M

    Power set P(S) with symmetry difference.

    its A Δ B not A Δ A. I don't know how to start this