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On the structure of Thom polynomials of singularities  [PDF]
L. M. Feher,R. Rimanyi
Mathematics , 2007,
Abstract: Thom polynomials of singularities express the cohomology classes dual to singularity submanifolds. A stabilization property of Thom polynomials is known classically, namely that trivial unfolding does not change the Thom polynomial. In this paper we show that this is a special case of a product rule. The product rule enables us to calculate the Thom polynomials of singularities if we know the Thom polynomial of the product singularity. As a special case of the product rule we define a formal power series (Thom series, Ts_Q) associated with a commutative, complex, finite dimensional local algebra Q, such that the Thom polynomial of {\em every} singularity with local algebra Q can be recovered from Ts_Q.
Thom polynomials of Morin singularities  [PDF]
Gergely Berczi,Andras Szenes
Mathematics , 2006,
Abstract: We prove a formula for Thom polynomials of Morin (or A_d) singularities in any codimension. We use a combination of the test-curve method of Porteous, and the localization methods in equivariant cohomology. Our formulas are independent of the codimension, and they are computationally efficient for d less than 7.
On second order Thom-Boardman singularities  [PDF]
L. M. Feher,B. Komuves
Mathematics , 2005, DOI: 10.4064/fm191-3-4
Abstract: In this paper we derive closed formulas for the Thom polynomials of two families of second order Thom-Boardman singularities \Sigma^{i,j}. The formulas are given as linear combinations of Schur polynomials, and all coefficients are nonnegative.
Positivity of Thom polynomials II: the Lagrange singularities  [PDF]
Malgorzata Mikosz,Piotr Pragacz,Andrzej Weber
Mathematics , 2007,
Abstract: We show that Thom polynomials of Lagrangian singularities have nonnegative coefficients in the basis consisting of Q-functions. The main tool in the proof is nonnegativity of cone classes for globally generated bundles.
Cobordism realizations of Thom polynomials of singularities  [PDF]
Andrei Kustarev
Mathematics , 2007,
Abstract: We define complex cobordism realizations of cohomological Thom polynomials and study their existence, uniqueness and other features. We show that problem is non-trivial on the example of $\Sigma^1$ singularity.
Contact Singularities  [PDF]
Frédéric Campana,Hubert Flenner
Mathematics , 2001,
Abstract: A contact singularity is a normal singularity $(V,0)$ together with a holomorphic contact form $\eta$ on $V\backslash$ Sing $V$ in a neighbourhood of 0, i.e. $\eta\wedge (d\eta)^r$ has no zero, where dim $V=2r+1$. The main result of this paper is that there are no isolated contact singularities.
Thom polynomials for maps of curves with isolated singularities  [PDF]
M. E. Kazarian,S. K. Lando
Mathematics , 2007,
Abstract: Thom (residual) polynomials in characteristic classes are used in the analysis of geometry of functional spaces. They serve as a tool in description of classes Poincar\'e dual to subvarieties of functions of prescribed types. We give explicit universal expressions for residual polynomials in spaces of functions on complex curves having isolated singularities and multisingularities, in terms of few characteristic classes. These expressions lead to a partial explicit description of a stratification of Hurwitz spaces.
Thom polynomials and Schur functions: the singularities I_{2,2}(-)  [PDF]
Piotr Pragacz
Mathematics , 2007,
Abstract: We give the Thom polynomials for the singularities $I_{2,2}$ associated with maps $({\bf C}^{\bullet},0) \to ({\bf C}^{\bullet+k},0)$ with parameter $k\ge 0$. Our computations combine the characterization of Thom polynomials via the ``method of restriction equations'' of Rimanyi et al. with the techniques of Schur functions.
Positivity of Legendrian Thom polynomials  [PDF]
Malgorzata Mikosz,Piotr Pragacz,Andrzej Weber
Mathematics , 2010,
Abstract: We study Legendrian singularities arising in complex contact geometry. We define a one-parameter family of bases in the ring of Legendrian characteristic classes such that any Legendrian Thom polynomial has nonnegative coefficients when expanded in these bases. The method uses a suitable Lagrange Grassmann bundle on the product of projective spaces. This is an extension of a nonnegativity result for Lagrangian Thom polynomials obtained by the authors previously. For a fixed pecialization, other specializations of the parameter lead to upper bounds for the coefficients of the given basis. One gets also upper bounds of the coefficients from the positivity of classical Thom polynomials (for mappings), obtained previously by the last two authors.
Thom polynomials and Schur funcions: the singularities $A_3(-)$  [PDF]
Alain Lascoux,Piotr Pragacz
Mathematics , 2008,
Abstract: Combining the "method of restriction equations" of Rim\'anyi et al. with the techniques of symmetric functions, we establish the Schur function expansions of the Thom polynomials for the Morin singularities $A_3: ({\bf C}^{\bullet},0)\to ({\bf C}^{\bullet + k},0)$ for any nonnegative integer $k$.
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