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Some papers (especially about Nested Words languages) ofter contain term "language of words". What is the difference between "language" and "language of words"?

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I don't think there is a difference; the author probably wants to insist on the fact that the language is made up of words. –  Najib Idrissi May 28 '11 at 11:23
    
@zulon: I have same suspicion. But: AFAIK they all made up of words -- what is the point? I do not understand. To make things worse, that wording repeats very often, not just once, and without any comments. –  Vag May 28 '11 at 11:28
    
This would be answered more readily at cstheory.stackexchange.com. I think it should be migrated. –  TheBigO May 28 '11 at 11:31
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@TheBigO: They will say "This is not reseach level question". –  Vag May 28 '11 at 11:35
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1 Answer

up vote 2 down vote accepted

They might be trying to avoid confusion with $\omega$-languages - languages whose elements are infinite sequences of letters ("infinite words"). Such languages have a rich and beautiful theory of their own. I can't think of other possible meanings.

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Oh! Thanks for the pointer; as I already said there are plenty of opportunities to miss entire research areas for every autodidact! –  Vag May 28 '11 at 15:17
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