Kevin Ryde on Sat, 03 Mar 2018 05:16:59 +0100


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Re: empty permutation true/false


Bill Allombert <Bill.Allombert@math.u-bordeaux.fr> writes:
>
> if(perm===0,...)
> if you do not want to depend on that.

That could be ok.  Does it mean don't know yet for == and its friends.
I also thought a symbol like 'none, absent better idea.