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- Institut d'Estudis Espacials de CatalunyaES488 papers
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105 papers · 1 filter
On two and three periodic Lyness difference equations
Anna Cima, Armengol Gasull, Victor Manosa
We describe the sequences {x_n}_n given by the non-autonomous second order Lyness difference equations x_{n+2}=(a_n+x_{n+1})/x_n, where {a_n}_n is either a 2-periodic or a 3-period…
Planar unclustered scale-free graphs as models for technological and biological networks
Alicia Miralles, Francesc Comellas, Lichao Chen +1
Many real life networks present an average path length logarithmic with the number of nodes and a degree distribution which follows a power law. Often these networks have also a mo…
Relevant phylogenetic invariants of evolutionary models
Marta Casanellas, Jesus Fernandez-Sanchez
Recently there have been several attempts to provide a whole set of generators of the ideal of the algebraic variety associated to a phylogenetic tree evolving under an algebraic m…
Separation of variables and explicit theta-function solution of the classical Steklov--Lyapunov systems: A geometric and algebraic geometric background
Yuri Fedorov, Inna Basak
The paper revises the explicit integration of the classical Steklov--Lyapunov systems via separation of variables, which was first made by F. Kötter in 1900, but was not well under…
Recent discoveries of supersoft X-ray sources in M 31
M. Henze, W. Pietsch, F. Haberl +9
Classical novae (CNe) have recently been reported to represent the major class of supersoft X-ray sources (SSSs) in the central area of our neighbouring galaxy M 31. This paper pre…
Ribet bimodules and the specialization of Heegner points
Santiago Molina
We describe the specialization of Heegner points on Shimura curves at primes of bad reduction. Moreover, we give some reciprocity laws relating the Galois action on these points to…