Abstract
Given an arbitrary Riemannian metric on the torus, a sharp lower bound for the area and a sharp upper bound for the first eigenvalue of the Laplacian is given in terms of the primitive length spectrum.
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Hebda, J.J. Two geometric inequalities for the torus. Geom Dedicata 38, 101–106 (1991). https://doi.org/10.1007/BF00147738
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DOI: https://doi.org/10.1007/BF00147738