Thanks to everyone who wrote about my seg< problem!  Just knowing that
folks are willing to answer my questions really encourages me, because
I know there's a lot I don't know.  

Freek, that's very  interesting! Evaluating this in HOL Light 
# help "new_definition";;
gives more information than is in the HOL Light Reference manual:

   FAILURE CONDITIONS

   new_definition fails if c is already a constant or if the
   definition does not have the right form.

That's what I needed to understand, and it's not in 
http://www.cl.cam.ac.uk/~jrh13/hol-light/HTML/new_definition.html
Your other suggestion 
#   help "new_constant";;
also lists a failure condition not in the manual:

FAILURE CONDITIONS

Fails if there is already a constant of that name in the current theory.

So I'll use the help feature when I get error messages!

Ramana, I have not yet read HOL Logic manual as you suggested on the
Isabelle group, but it sounds like a good idea, especially as I did
not find the Old user manual on the HOL Light web page very helpful.

-- 
Best,
Bill 

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