Abstract
The paper develops second Thomae theorem in hyperelliptic case. The main formula, called general Thomae formula, provides expressions for values at zero of the lowest non-vanishing derivatives of theta functions with singular characteristics of arbitrary multiplicity in terms of branch points and period matrix. We call these values derivative theta constants. First and second Thomae formulas follow as particular cases. Some further results are derived. Matrices of second derivative theta constants (Hessian matrices of zero-values of theta functions with characteristics of multiplicity two) have rank three in any genus. Similar result about the structure of order three tensor of third derivative theta constants is obtained, and a conjecture regarding higher multiplicities is made. As a byproduct, a generalization of Bolza formulas are deduced.
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Acknowledgements
The problem of obtaining general Thomae formula was posed by Y. Kopeliovich, who also encouraged the author to work on it. The author is grateful to Y. Kopeliovich and V. Enolski for fruitful discussion.
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Bernatska, J. General derivative Thomae formula for singular half-periods. Lett Math Phys 110, 2983–3014 (2020). https://doi.org/10.1007/s11005-020-01315-8
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DOI: https://doi.org/10.1007/s11005-020-01315-8