Yes, it is valid.
The form
[]
internally can be
((mlist) )
or
((mlist simp) )
or
((mlist simp ....<anything at all>) )
The <anything at all> can be some collection of tags that has
been generated and put on the cdar of an expression.
I have never seen this particular kind of tag, but it
is not illegal.
Usual tags are simp, factored, irreducible, ratsimp. Maybe
a few others.
RJF
Dan Stanger wrote:
> I am encountering unexpected behavior with the test scripts.
> It seems that in rtest15, [] has the value:
>
> ((MLIST SIMP (50 "rtest15.mac" SRC)))
>
> Is this a valid value in this list?
>
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