Re: Composition again

I don't think it makes sense to make a special case for requiring spaces around "$", as TH won't be in H'.

I agree, there's absolutely no need to treat $ differently in H'. The situation will already be better than it is now, since by the special treatment of . (and - and !, which I also agree with), there will be a precedent to follow (assuming it gets accepted of course). That alone makes it much easier to define the meaning of extensions like $ in TH. Cheers, /Niklas