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*To*: Aubrey Jaffer <agj@xxxxxxxxxxxx>*Subject*: Re: multiplicative inverse of 0.0*From*: Bakul Shah <bakul@xxxxxxxxxxxxx>*Date*: Sat, 22 Oct 2005 14:52:09 -0700*Cc*: srfi-77@xxxxxxxxxxxxxxxxx*Delivered-to*: srfi-77@xxxxxxxxxxxxxxxxx*In-reply-to*: Your message of "Sat, 22 Oct 2005 13:52:12 EDT." <20051022175212.17A9F1B77BB@xxxxxxxxxxxxxxxxxxxxx>

> | (/ 0.0) ==> +nan.0 > | (/ 1.0 0) ==> +inf.0 > | (/ -1 0.0) ==> -inf.0 > | (/ +inf.0) ==> 0.0 > > If 0.0 is the multiplicative inverse of +inf.0, then +inf.0 must be > multiplicative inverse of 0.0. But (/ 0.0) ==> +nan.0. Which line is > correct? By definition, if A' is a multiplicate inverse of A, A * A' = 1 This is not the case for +inf.0 or 0.0. So we have two choices: 1) (/ 0.0) => NaN (/ +inf.0) => NaN (/ -inf.0) => NaN 2) To indicate that for any number X (/ X) == (/ 1.0 X) and drop the phrases "multiplicative inverse".

**References**:**multiplicative inverse of 0.0***From:*Aubrey Jaffer

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