# Squiggle arrow... what is it?

• March 24th 2011, 06:53 AM
GordonComstock
Squiggle arrow... what is it?
Hi. I've met a symbol like this: File:U+21DC.gif - Wikipedia, the free encyclopedia in an equation, at the end of it. In that equation, it was downwards. What is it used for? Thanks!
• March 24th 2011, 07:02 AM
TheChaz
What was the equation? It might be a contradiction...
Contradiction - Wikipedia, the free encyclopedia
$g(r)=p_k\left [ \frac{nr(1+r)^n}{(1+r)^n-1} -1 \Downarrow \ \right ]$
Where I've put $\Downarrow$, there is that squiggle arrow.