ar X iv : 0 90 1 . 39 84 v 1 [ cs . D B ] 2 6 Ja n 20 09 Stop the Chase

ar X iv : 0 90 1 . 46 64 v 1 [ cs . L O ] 2 9 Ja n 20 09 Square root meadows ∗

Let Q0 denote the rational numbers expanded to a meadow by totalizing inversion such that 0 = 0. Q0 can be expanded by a total sign function s that extracts the sign of a rational number. In this paper we discuss an extension Q0(s, √ ) of the signed rationals in which every number has a unique square root.

ar X iv : 0 90 1 . 39 43 v 1 [ as tr o - ph . S R ] 2 6 Ja n 20 09 Solar analogues in open clusters : The case of M 67

Solar analogues are fundamental targets for a better understanding of our Sun and our Solar System. Usually, this research is limited to field stars, which offer several advantages and limitations. In this work, we present the results of a research of solar twins performed for the first time in a open cluster, namely M67. Our analysis allowed us to find five solar twins and also to derive a sol...

ar X iv : 0 90 2 . 32 39 v 1 [ m at h . D G ] 1 8 Fe b 20 09 Gauge theory in higher dimensions , II

ar X iv : 0 90 7 . 09 39 v 1 [ cs . A I ] 6 J ul 2 00 9 The Soft Cumulative Constraint

This research report presents an extension of Cumulative of Choco constraint solver, which is useful to encode over-constrained cumulative problems. This new global constraint uses sweep and task interval violation-based algorithms.

ar X iv : 0 90 1 . 38 34 v 1 [ m at h . N T ] 2 4 Ja n 20 09 On the Inverse Problem Relative to Dynamics of the w Function

In this paper we shall study the inverse problem relative to dynamics of the w function which is a special arithmetic function and shall get some results.