Titlebook: Singularities and Computer Algebra; Festschrift for Gert Wolfram Decker,Gerhard Pfister,Mathias Schulze Book 2017 Springer International Pu

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,Seiberg–Witten Invariant of the Universal Abelian Cover of ,,ies of normal surface singularities, especially with functorial behaviour of the (equivariant) geometric genus of singularities. We present several examples in order to find the validity limits of the proved property, one of them shows that the covering additivity property is not true for negative definite plumbed 3-manifolds in general.

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Book 2017-Martin Greuel’s 70th birthday. This unique volume presents a collection of recent original research by some of the leading figures in singularity theory on a broad range of topics including topological and algebraic aspects, classification problems, deformation theory and resolution of singularitie

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e variety of techniques, ranging from theoretical methods toThis book arose from a conference on “Singularities and Computer Algebra” which was held at the Pfalz-Akademie Lambrecht in June 2015 in honor of Gert-Martin Greuel’s 70th birthday. This unique volume presents a collection of recent origina

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易发怒

On Welschinger Invariants of Descendant Type, The counted curves are equipped with Welschinger-type signs. We prove that such a count does not depend neither on the choice of the point-arc configuration nor on the variation of the ambient real surface. These invariants can be regarded as a real counterpart of (complex) descendant invariants.

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A Classification Algorithm for Complex Singularities of Corank and Modality up to Two,er for, in particular, all isolated hypersurface singularities over the complex numbers up to modality 2. Building on a series of 105 theorems, this classifier determines the type of the given singularity. However, for positive modality, this does not fix the right equivalence class of the singulari

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