Abstract
In this paper, we first single out a proper subgroup \Gamma of Sp(4,Z)
generated by three elements, which arises from the parallelogram decompositions
of translation surfaces in H(2). We then prove that the space H(2)/C* can be
identified to the quotient J_2/\Gamma, where J_2 is the Jacobian locus in the
Siegel upper half space H_2, in other words, the group \Gamma is the image in
Sp(4,Z) of the fundamental group of the space H(2)/C*. A direct consequence of
this fact is that Sp(4,Z):\Gamma=6.
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