Hi Ivar,

Thanks for your thoughts and ideas.    Unfortunately, none of those leads 
seem to be the the root of the problem: 

* I just reloaded a second session -- and also tried a different name, 
"SqrDiff2()", but got the same error message when trying to apply map.

* I was pasting everything into REPL, but tried running from script, and 
got the same error message.

-Mike
 

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