On the Frobenius number of a proportionally modular Diophantine inequality.
Delgado, M., Rosales, J.C. (2006)
Portugaliae Mathematica. Nova Série
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Delgado, M., Rosales, J.C. (2006)
Portugaliae Mathematica. Nova Série
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J.B. Tunnell (1983)
Inventiones mathematicae
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Ong, Darren C., Ponomarenko, Vadim (2008)
Integers
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José Carlos Rosales, Pedro A. García-Sánchez, Juan Ignacio García-García, M. B. Branco (2005)
Czechoslovak Mathematical Journal
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We study numerical semigroups with the property that if is the multiplicity of and is the least element of congruent with modulo , then . The set of numerical semigroups with this property and fixed multiplicity is bijective with an affine semigroup and consequently it can be described by a finite set of parameters. Invariants like the gender, type, embedding dimension and Frobenius number are computed for several families of this kind of numerical semigroups.
Tripathi, Amitabha, Vijay, Sujith (2006)
Journal of Integer Sequences [electronic only]
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René Schoof, Nikos Tzanakis (2012)
Acta Arithmetica
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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.