I've seen this expression a few times but without an explanation. Is the following true:
I don't have the included inside the square root though... Is that by convention? Because we're talking about something that's supposed to have a real value?
Thanks for your help.
Thank you for the replies.
My question about the imaginary unit was silly so please disregard.
I figured out what I wanted.
PS. Slovakiamaths, sorry but I don't have enough posts to reply to your PM. I'm not studying in Poland though.