# Thread: Squiggle arrow... what is it?

1. ## 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!

2. What was the equation? It might be a contradiction...
Contradiction - Wikipedia, the free encyclopedia

Without more context, I'm just shootin in the dark!

3. Thank you for your answer, I'll scan it later and post the image of it.

4. $\displaystyle g(r)=p_k\left [ \frac{nr(1+r)^n}{(1+r)^n-1} -1 \Downarrow \ \right ]$

Where I've put $\displaystyle \Downarrow$, there is that squiggle arrow.

The function in square brackets is monotonically increasing function of r.
Thanks again.