Bill Page wrote:
>
> There is some unpleasant code in DERHAM that presumes knowledge of the
> Rep of AntiSymm:
>
> terms : % -> List Record(k: EAB, c: R)
> terms(a) ==
> -- it is the case that there are at least two terms in a
> a pretend List Record(k: EAB, c: R)
>
> I recall that this sort of thing was done elsewhere in some of the
> FriCAS code for polynomials but maybe it would be better to get rid of
> at least this case right now. What do you think?
This looks like relatively easy to eliminate. OTOH AntiSymm
contains more such things.
Going directly to represetation makes sense if operation
can not be done otherwise or if there is significant
performance gain. In this case official inteface should
be enough. 'terms' is used for printing and should not
be performance critical. Concerning uses of representation
in AntiSymm I do not think that this is important, but
it would be good to have some timings.
--
Waldek Hebisch
[email protected]
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