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Proof with Computer and Algebraic Geometry
We give a human-computer-aided  proof of the Theorem .
Construction: Fix the word  w   =   X-1 Y X Y-1 X  and consider the matrices x , y in PSL(2,p):
x = | 0  -1 |                     y = | 1        b  |
| 1     t |                     | c   1+bc |
Note: U1 ( x , y ) = 1   has no solution over Fp .
The entries of   U1 ( x , y ) - U2 ( x , y )   create a polynomial ideal   I   in   Z[b,c,t]  .
Statement: The theorem holds for PSL(2,p) <==> V(I) has a rational point in (Fp)3.
We show: V(I)   has rational points over   Fp  for all prime numbers p>3.
What is needed.

Lille, 08-07-02 http://www.singular.uni-kl.de