11 research outputs found
Classification of singular Q-homology planes. I. Structure and singularities
Full text linkA Q-homology plane is a normal complex algebraic surface having trivial
rational homology. We obtain a structure theorem for Q-homology planes with
smooth locus of non-general type. We show that if a Q-homology plane contains a
non-quotient singularity then it is a quotient of an affine cone over a
projective curve by an action of a finite group respecting the set of lines
through the vertex. In particular, it is contractible, has negative Kodaira
dimension and only one singular point. We describe minimal normal completions
of such planes.Comment: improved results from Ph.D. thesis (University of Warsaw, 2009), 25
pages, to appear in Israel J. Mat
The Agnihotri--Woodward--Belkale polytope and Klyachko cones
No full textOriginal Russian Text © S. Yu. Orevkov, Yu. P. Orevkov, 2010, published in Matematicheskie Zametki, 2010, Vol. 87, No. 1, pp. 101-107International audienc
T → d+n vertex function and its correlation with the triton binding energy and with the doublet nd scattering length
No full textDoublet coulomb-nuclear scattering length and other parameters of the effective-range function for proton-deuteron scattering from an analysis of present-day data
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