On Sat, Dec 31, 2005 at 05:36:58AM +0900, James Edward Gray II wrote:
> On Dec 30, 2005, at 2:18 PM, J. Ryan Sobol wrote:
> 
> >Are negative numbers and zero allowed to be a starting point or  target?
> 
> Zero seems fine as a starting number.  You can always add_two.
> 
> You can't get a negative, unless you start with one.  If you do,  other 
> negative targets and even a target of 0, seem fine.  Some  numbers would be 
> impossible to reach though.

Heh, I couldn't figure out how to get a negative number using double, halve,
and add_two from the number 1.  Then I realized the problem wasn't with my
math, but with my English :-)

That, or I'm really confused.
Jeff