Ralf Hemmecke wrote:
>
> On 07/24/2015 12:43 AM, Waldek Hebisch wrote:
> > OrderedFreeMonoid and FreeMonoid
>
> > Opinions?
>
> I'm in a hurry, so only a short message. Without looking into the code I
> am somehow opposed to removing OrderedFreeMonoid. The reason would be
> that it carries semantical information (i.e. Axioms) which would not be
> there via Join(Ordered, FreeMonoid). So if some category wants to
> inherit from OrderedFreeMonoid, it inherits automatically its axioms.
Hmm, FreeMonoid is domain. Morover, rather concrete domain.
So axioms are there, regardless if you want them or not.
If you really want to hide some properties, than given
rich domain one can use rather trivial forgetful functor
for hiding. OTOH, there is no generic way to create
information from nothing, so normal policy is to export
all natural properties.
--
Waldek Hebisch
[email protected]
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