The sum of two finite numbers is finite. Both and are finite, so is finite. Perhaps there is a more 'professional' way of doing this, but wording it like this seems sufficient.
Im not in a hurry, but I dont know where to post this (easy) question.
I know this:
Now I want to show that
I guess this is true, because I think it is obvious, but isn't there a professional proof on this?
What do you think?
Any comments would be much appreciated.