# complex variable!

• December 12th 2012, 06:34 AM
lawochekel
complex variable!
hello guys, wondering why this expression

$-\mid(-Z)\mid$ should give +Z while $-\mid-Z\mid$ should give -Z

pls i need reassurance on this, thanks
• December 12th 2012, 07:13 AM
emakarov
Re: complex variable!
If $|u|$ denotes the absolute value of $u$, then $-|(-z)|$ and $-|{-z}|$ are the same expression, and it is not true that $-|{-z}|=z$ or $-|{-z}|=-z$ for all complex $z$.