Versal normal form for nonsemisimple singularities
نویسندگان
چکیده
منابع مشابه
The Versal Deformation of Cyclic Quotient Singularities
We describe the versal deformation of two-dimensional cyclic quotient singularities in terms of equations, following Arndt, Brohme and Hamm. For the reduced components the equations are determined by certain systems of dots in a triangle. The equations of the versal deformation itself are governed by a different combinatorial structure, involving rooted trees. One of the goals of singularity th...
متن کاملP-Resolution Fans and Versal Component Dimension for Cyclic Quotient Singularities
We use Altmann’s toric fan description of P-resolutions [Alt98] to calculate dimensions of the (reduced) versal base space components for two-dimensional cyclic quotient singularities.
متن کاملKawachi’s Invariant for Normal Surface Singularities
We study a useful numerical invariant of normal surface singularities, introduced recently by T. Kawachi. Using this invariant, we give a quick proof of the (well-known) fact that all log-canonical surface singularities are either elliptic Gorenstein or rational (without assuming a priori that they are Q -Gorenstein). In §2 we prove effective results (stated in terms of Kawachi’s invariant) reg...
متن کاملOn −k for Normal Surface Singularities
In this paper we show the lower bound of the set of non-zero−K for normal surface singularities establishing that this set has no accumulation points from above. We also prove that every accumulation point from below is a rational number and every positive integer is an accumulation point. Every rational number can be an accumulation point modulo Z. We determine all accumulation points in [0, 1...
متن کاملYang-Mills theory for nonsemisimple groups
For semisimple groups, possibly multiplied by U~1!’s, the number of Yang-Mills gauge fields is equal to the number of generators of the group. In this paper, it is shown that, for nonsemisimple groups, the number of Yang-Mills fields can be larger. These additional Yang-Mills fields are not irrelevant because they appear in the gauge transformations of the original Yang-Mills fields. Such nonse...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Differential Equations
سال: 2019
ISSN: 0022-0396
DOI: 10.1016/j.jde.2019.03.039