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Aubrey Jaffer <agj@xxxxxxxxxxxx> writes: > So in a Scheme implementation which has "arbitrarily big" precision, > how many digits is (sqrt 2)? How many digits is (sin 7/5)? There is no function "precision-of", so there is no need for an answer. Arbitrarily big precision arithmetic (generally) works pretty well; you carry around symbolic representations and operate on them.