Alexander Vodomerov <[EMAIL PROTECTED]> wrote in article <[EMAIL PROTECTED]> in 
gmane.comp.lang.haskell.cafe:
> The question is: how can this "theorem" be formulated (and prooved) in
> mathematically precise way?

It seems to me that you can define a type-directed translation from the
old denotations to the new ones.  Also check out:

Robert Cartwright and Matthias Felleisen. 1994. Extensible denotational
language specifications. In Theoretical aspects of computer software:
International symposium, ed. Masami Hagiya and John C. Mitchell,
244-272. Lecture Notes in Computer Science 789, Berlin: Springer-Verlag.
http://www.ccs.neu.edu/scheme/pubs/tacs94-cf.dvi.gz
http://www.ccs.neu.edu/scheme/pubs/tacs94-cf.ps.gz

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I think that it is much more likely that the reports of flying saucers
are the result of the known irrational characteristics of terrestrial
intelligence rather than the unknown rational efforts of extraterrestrial
intelligence. -Richard Feynman

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