# Search results

1. ### A stubborn integral

Homework Statement I have to integrate http://img69.imageshack.us/img69/4259/integral1.gif [Broken] The Attempt at a Solution This is how I did it [PLAIN]http://img338.imageshack.us/img338/5508/integral12.gif [Broken] wolfram says it is supposed to turnout like this...
2. ### Help with algebra Invertible matrixes

hi Homework Statement I have to prove or disprove the following statements: 1. Let B be a square matrix nxn. Then there must be an Invertible A such that AB is an upper triangular matrix. 2. Let A be a square Invertible matrix nxn such that the sum of all the entries in each row is...
3. ### Strange matrix problem

Got it now, thanks!
4. ### Strange matrix problem

O.K Iunderstand the technical side of what you are saying Av=0, but the equation you get is 0w=0. How can this have any meaning?
5. ### Strange matrix problem

Do you mean that if we assign w=t a general solution could be V=(0,0,0,t)?
6. ### Strange matrix problem

Hi, Homework Statement I was given a linear equation system of the form Ax=b where x=(x, y, z, w), I reduced (A|b) to its canonical form which is this: Homework Equations The Attempt at a Solution At first I thought that this means that there is an infinite number of...