1. Re: subscripts (Long Post)
Here's my two cents. <plug> I'm working on something with my matheval
toolkit (see the user contributions page), namely substituting mathematical
identities within an expression, which could be buried anywhere in the
structure of the expression. </plug>
Basically, it's a specialized pattern matcher that will find things like
trig identities buried within [deeply nested] sequences, and replace them
with whatever the appropriate identity would be (eg, cos^2(x+1) + sin^2(x+1)
==> 1). But, of course, this could be buried anywhere, and I need to be
able to get in to do the substitution. Rather than using a bunch of
complicated recursion as I am currently attempting, it would be a lot easier
to subscript using sequences.
I understand that this would sully the 'clean' subscripting that Eu has now,
and that might make it not worth changing, but this seems like it would
definitely be a powerful addition. Another argument in favor of
subscripting by sequence might be the inherent flexibility of sequences
themselves. We can do all sorts of operations on them, but can only access
them in one way.
Matt Lewis
