Recent content by Braka

Its obvious? I can't recall how to get it. What I meant is I wanted to put it in a +bi form. That is my problem. Sorry for stating it in a confusing manner

Homework Statement I am looking for the fifth roots of unity, which I believe come in the form of: cos(2kpi/5) + isin(2kpi/5), k=1,2,3,4,5 and when k=5, the complex number is 1. how do you convert the rest to complex numbers? Normally, I use common triangles like: 45-45-90 and...

Homework Statement The question is: Let A be a subset of Sn that contains all permutations alpha such that alpha can be written as a product of an even number of transpositions. Prove that A is a group with product of permutations. I understand what I need to do to prove it, but I am not...

The problem is prove that for every square singular matrix A there is a nonzero square matrix B, such that AB equals the zero matrix. I got AB to equal the identity matrix, but not the zero matrix.

The problem is prove that for every square singular matrix A there is a nonzero matrix B, such that AB equals the zero matrix. I got AB to equal the idenity matrix, but have no clue how to get it to the zero matrix.