The file wpt is a mapleV5R5 file. It computes explicitely the functions
 occuring in the Weierstrass preparation theorem and apply this to compute
 the common zeros of two power series in two variables (in order to apply 
elliptic curve Chabauty's method in some cases).

The file matrixW is a mapleV5R5 file. It computes the matrix of the 
addition of an element of order 2 on the kummer variety of hyperelliptic 
curves of genus 3 defined by a polynomial of degree 7 as explained 
in my thesis.

The file matrixWr is the result of the previous computation.

The file biquadratic is a mapleV5R5 file. It computes, for any given curve 
of genus 3 defined by a polynomial of degree 7, the biquadratic forms such 
that, projectively:
( Phi[i,j] ) = ( k_i(A+B) k_j(A-B) + k_i(A-B) k_j(A+B) )

The file biquadratic2 is a magma translation of biquadratic. This program 
allows us to compute the biquadratic forms for a general curve of genus 3 
defined by a polynomial of degree 7. The file of this result is biquad.gz.
Nevertheless this file is very long to read and need a lot of memory. If 
you only need to work with a given curve, it's better to recompute them 
using biquadratic.