On Thu, 4 Jul 2013 04:49:16 -0700 (PDT)
vdelecroix <[email protected]> wrote:
> If the differential forms are somewhat immutable we may also save the
> result of is_zero once for all. Why do not make is_zero a
> cached_method of symbolic expressions ?
Do you mean wrapping sage.symbolic.expression.Expression.is_zero() with
the cached_method decorator?
Symbolic expressions are not really immutable. It is possible to
declare new assumptions (with the assume() function), change properties
of the variables (with var('x', domain=RR)) and change the result of
is_zero(). Caching results of calls to Maxima is not an option.
On the other hand, improving the implementations of __nonzero__() and
test_relation() method in sage.symbolic.expression.Expression is
definitely possible.
Cheers,
Burcin
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