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Ken Dickey wrote: > But computational infinities are not really numbers. That's all a matter of definition. People used to think that zero "is not really a number." Some may think that a number is anything that obeys certain mathematical laws. I think of the type "extended-exact-rational" as comprising fractions plus 1/0 and -1/0. I think that extended set has some nice properties, providing reasonable definitions for some otherwise undefineds operation. On the other hand, some operations, such as (+ 1/0 -1/0), remain undefined. Aesthetically, I like having 1/0 and -1/0 as exact numbers. Not being a mathematician, I won't express a strong opinion, though. > BTW, as markers I would expect > (eq? 1/0 1/0) -> #t Likewise if they're viewed as exact numbers. -- --Per Bothner per@xxxxxxxxxxx http://per.bothner.com/