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Re: arithmetic issues
NaNs are atoms -- they have no context or stucture, just a single value.
With the understandable exception of the eof object (and as has been
noted, this is exception is not universal), Lisps and Schemes
tranditionally provide read syntax for atoms. So, tradition suggests
that we should have a read syntax for NaNs.
Dr Alan Watson
Centro de Radioastronomía y Astrofísica
Universidad Astronómico Nacional de México