On 10 Jan 2007, at 16:04, Peter Hickman wrote: [snip] > Don't recall Pop-11 doing that. Did I miss it or was it introduced > after 2002? Good lord! Somebody who has used Pop-11! (I'm pretty sure you missed it. It was certainly in there when I was using it in the late eighties / early nineties. The square root of -1 got you a complex number too :-) Cheers, Adrian