I have got some questions ¡­

I have got some questions about the use of the ~ in eq. 3 of the problems- it means "proportional to"- but I admit this is a bit unprecise. I should for inst have written instead of ~

= a \times , where |a|=1

The background for using ~ was differnt sign conventions, number og imaginary units , which I didnt want that you would struggle with... JOE