On Thu, 6 Dec 2007, Bill Page wrote:

| If you wish can treat the sequence of symbols:
| 
|   ( x ( x x ( x ( x ) ) x ) )
| 
| as encoding a kind of "curve" is some abstract differential geometry.
| Then each '(' and ')' token has some associated unit "curvature" or
| something like that. But I do not see any advantage to this point of
| view.

Are the '(' and ')' needed?  And in case they are needed, why
should they be thought of as curvature, as opposed to mere boundary markers?

-- Gaby

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