Hi Guys, I have been experimenting with converting all the Tierazon fractals to bignum. The only one I struggled with uses sqrt_bf(). I notice that this isn’t used anywhere in fractint, so I’m not sure if anyone has played with it. My fractal works okay if I use: ln_bf(); half_bf(); exp_bf(); but it is slower. I wrote a simple test program to check sqrt_bf() and it seemed to work okay for low precision numbers. Does anyone have any ideas? Thanks, Paul. ---------------------------------------------------------- Paul de Leeuw Computers NSW Central Coast, Australia Email: pdeleeuw@deleeuw.com.au www: <http://www.deleeuw.com.au <http://www.deleeuw.com.au/> > ABN 72 360 822 562 ----------------------------------------------------------