Huh? I thought shuffle does not work (because 1111... sh 1111... would
be a sum of infinitely many identical words), but uv is well-defined
(and equals u when u is infinite)?

On Sun, Jan 5, 2014 at 7:08 PM, Christian Stump
<christian.st...@gmail.com> wrote:
>> Yes, but it's associative, so it works... (Except I don't expect it to
>> have much of a use.)
>
>
> can you be more specific? How is the product uv defined? I see that you have
> a shuffle product defined, but I don't see that you have concatenation...
>
> Thanks, Christian
>
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