>    To make this set really useful
>    there must be a function (less :: "Real" -> "Real" -> Bool), 
>    which always terminates and checks absolutely sure, if the 
>    first argument is less than the second.

     It will be useful enough if one of the numbers is a constant.
     Otherwise you could check for equality of "a" and "b" by
     (not (less a b) && not (less b a)).
     That was not what I wanted to say.
-------------------------------------------------------------------------------
 Christoph Herrmann
 E-mail:  [EMAIL PROTECTED]
 WWW:     http://brahms.fmi.uni-passau.de/cl/staff/herrmann.html


    


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