[Rd] Syntactically valid names

[Davor Cubranic]

On July 5, 2011 04:59:16 PM Hadley Wickham wrote:
> That's not a syntactically valid name - you use backticks to refer to
> names that are not syntactically valid.

I was too loose in my terminology: I meant that `x prime` is a valid name, but 
as you said, it is not syntactically valid.

Davor