The Picard group of Siegel modular threefolds.
R. Weissauer (1992)
Journal für die reine und angewandte Mathematik
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R. Weissauer (1992)
Journal für die reine und angewandte Mathematik
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D. Choi (2006)
Acta Arithmetica
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Besser, Amnon (1997)
Documenta Mathematica
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Noriko Yui (1978)
Journal für die reine und angewandte Mathematik
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Karl Mahlburg, Ken Ono (2004)
Acta Arithmetica
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Riccardo Salvati Manni (1993)
Journal für die reine und angewandte Mathematik
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Harris Hancock (1898)
Journal für die reine und angewandte Mathematik
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Roelof W. Bruggeman (1986)
Journal für die reine und angewandte Mathematik
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A. Cayley (1876)
Journal für die reine und angewandte Mathematik
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Hidegoro Nakano (1968)
Studia Mathematica
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(2013)
Acta Arithmetica
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The classical modular equations involve bivariate polynomials that can be seen to be univariate in the modular invariant j with integer coefficients. Kiepert found modular equations relating some η-quotients and the Weber functions γ₂ and γ₃. In the present work, we extend this idea to double η-quotients and characterize all the parameters leading to this kind of equation. We give some properties of these equations, explain how to compute them and give numerical examples.
V.K. Murty, D. Ramakrishnan (1987)
Inventiones mathematicae
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F. Hirzebruch, D. Zagier (1976)
Inventiones mathematicae
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Alexandru Buium, Arnab Saha (2011)
Banach Center Publications
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We prove that some of the basic differential functions appearing in the (unramified) theory of arithmetic differential equations, especially some of the basic differential modular forms in that theory, arise from a "ramified situation". This property can be viewed as a special kind of overconvergence property. One can also go in the opposite direction by using differential functions that arise in a ramified situation to construct "new" (unramified) differential functions.