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On Sun, 23 Oct 2005, [ISO-8859-1] Jens Axel Søgaard wrote: >Say I want to write my own mathematical function and need to return NaN? >E.g. > > (if <check-arguments> > <calculate-result> > #<not-a-number> Okay, how about a library function: (define NaN (lambda() "return a NaN for use in other functions, because there is no read/write syntax for NaN." (/ 0.0 0.0))) then you can write: (if <check-arguments> <calculate-results> (NaN)) So your code is clear and readable, and yet you don't have a read/write syntax that makes it unclear whether read is failing or just reading an error. Bear