# Library hierarchy, contd.

**Jan Skibinski
**
jans@numeric-quest.com

*Thu, 24 May 2001 04:37:29 -0400 (EDT)*

Dylan mentions "matrix classes" and then concludes:
>* Maybe "Computational" would be a better name than "Numeric"?
*
I've been trying to demonstrate that there more to
"matrix" than just data structure or just simple linear
equation solver. It is easy to come up with the latter,
or with a set of primitive product operations. But people
seem to be ignoring the fact that there is much more to linear
algebra than those trivialities. Eigenproblems for
example... Dense cases, sparse cases and all that Pandorra
box of non-trivial engineering tools.
These things are still alive, thank you very much, and
the papers are still written about them every day. Neither
the problems nor the papers are trivial.
Yet they are being ignored in your hierarchy.
Please, mark at least some spot for them. And do not tie them
to "matrix" because "matrix" is just one specific representation
of operator algebra -- as I am showing in some modules
of mine, for example.
I do not care what name you choose. Computational?
Linear algebra? But please do not ignore them altogether.
Jan