The Purplemath Forums

Is it posible : ||a+b||= |a| + |b| &/or
||a|+|b||=|a|+|b| ?
Is there some properties for those equations?

tnks so much!! It really heped me. But actually what I'm really want to know is if the absolute-value of an equation can have a superior absolute-value. And if the answere is positive where can i find it, becuse i've been lookign after that the whole day and all I get is the usual properties and ide...