### Hecke eigenforms

The programs used for the paper

Hecke eigenforms in the Cuspidal
Cohomology of Congruence Subgroups of SL(3,Z),

Experimental Mathematics
6 (1997), 163-174,

have been packed in
a
zipped tar file
(cf. the

instructions to unpack
)

### Intersection Cohomology

We have

implemented the recursions in the paper

T.A. Springer,
*Intersection Cohomology of
B×B orbits in group compactifications*,
Journal of Algebra 258 (2002) 71-111.

### Lenstra Lenstra Lovász

Our

implementations
of the extended Lenstra Lenstra Lovász algorithm (with integer
arithmetic and allowing dependent generators) try to use smaller integers than,
say,
the implementation in

GP/PARI Version
1.38.71.
One can prove

complexity bounds
for our algorithm that are similar to those
proved for the original LLL algorithm.
One can also do

such an analysis
for the Hermite Normal Form algorithm of
Havas, Majewski, Matthews. One may use the same principles
to avoid coefficient explosion in a straightforward

GCD based
Hermite Normal Form algorithm. It is just a matter of understanding
where the explosion is produced. Severe countermeasures like modular
arithmetic are quite unnecessary.

### Shortest vector in a lattice

The

Mathematica Package

ShortestVector
depends on the Mathematica Package

LLLalgorithm.

### Style files for LaTeX

To make an Index with pagerefs under LaTeX
To make many Indexes under LaTeX

### Chladni plates

These pictures have been made with
a Mathematica

package for a
simple model of round and square Chladni plates. Note that plates are
not membranes, so that the wave equation does not apply.