Topic: A 'little' Math Problem

Hi. Sorry for bringing this to this forum

I am having great problems in finding out how to use the cauchy's convergence test.

I have to show that following sequence is a cauchy sequence:

X1 = 1
Xn+1 = 1-((Xn^2)/2)

anyone got a clue/link/hint.

thanks for the help

Google to the rescue?!

http://www.google.com/search?source=ig&hl=en&rlz=&=&q=show+that+following+sequence+is+a+cauchy+sequence%3A++X1+%3D+1+Xn%2B1+%3D+1-%28%28Xn^2%29%2F2%29&aq=f&oq=&aqi=

WebShaman | The keenest sorrow (and greatest truth) is to recognize ourselves as the sole cause of all our adversities.
- Sophocles

Thanks for the effort ^^ i found my self someone who will take some time to explain it to me.