- #1
Diffy
- 441
- 0
I don;t think the actual problem I am trying to prove is relevant. But I have got to a step in my proof where I must show that | a - b | = | -(a - b)|
So by definition
|a - b| = +/- (a-b)
and |-(a - b)| = +/- (- (a - b)) = +/- (a-b)
Thus the two are equal.
Is this acceptable?
Or do I really need to break it down into cases where a - b is Positive negative or 0?
Thanks.