> On Wed, Dec 3, 2008 at 7:04 AM, Ralf Hemmecke wrote:
> ...
>> As far as I remember, the interpreter never applies 'convert'
>> or 'retract' automatically. But how does it find out about a
>> possible coercion?
>
On Wed, Dec 3, 2008 at 8:55 AM, Bill Page wrote:
> I am still uncertain, however I think that there maybe something
> missing in the code that is supposed to treat SubDomain as a
> special case.
>

I found at least two places where critical knowledge of sub-domains is
built into FriCAS as a special case.

See: 'Built-in' section of:

http://axiom-wiki.newsynthesis.org/SandBoxNonZeroInteger

In general I think the FriCAS library compiler support for SubDomain
should be more complete so that such built-in knowledge is
unnecessary.

Comments would be most appreciated.

Regards,
Bill Page.

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