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(* 0 +inf.0) ==> +nan.0 ... (/ 0 0.0) ==> unspecified (/ 0.0 0) ==> +nan.0 (/ 0.0 0.0) ==> +nan.0 Why is only (/ 0 0.0) out of this set unspecified? How should (/ 0 0) behave? -=-=-=-=- The description of `+' and `*' says: If any of these procedures are applied to mixed non-rational real and non-real complex arguments, they either report a violation of an implementation restriction or return an unspecified number. The only non-rational real numbers in current implementations are +inf.0 and -inf.0. Is this what was intended? If so, calling them infinities would be less cryptic. Shouldn't that sentence also appear in the description of `-' and `/'? It allows return of "an unspecified number." Does that allow a NaN to be returned?