Symmetric lagrangian singularities and Gauss maps of theta divisors.- On infinitesimal deformatio... more Symmetric lagrangian singularities and Gauss maps of theta divisors.- On infinitesimal deformations of minimally elliptic singularities.- C-Regularite et trivialite topologique.- Folding maps and focal sets.- The dual graph for space curves.- On the components and discriminant of the versal base space of cyclic quotient singularities.- - equivalence and the equivalence of sections of images and discriminants.- Differential forms and hypersurface singularities.- Local reflexional and rotational symmetry in the plane.- The intersection form of a plane isolated line singularity.- On the degree of an equivariant map.- Automorphisms of direct products of algebroid spaces.- Disentanglements.- The euler characteristic of the disentanglement of the image of a corank 1 map germ.- Vanishing cycles for analytic maps.- On complete conditions in enumerative geometry.- Right-symmetry of mappings.- Deformations and the milnor number of non-isolated plane curve singularities.- Vanishing cycles and special fibres.- On the versal deformation of cyclic quotient singularities.- On Canny's roadmap algorithm: orienteering in semialgebraic sets (an application of singularity theory to theoretical robotics).- Elliptic complete intersection singularities.- Pencils of cubic curves and rational elliptic surfaces.
Grundlehren der mathematischen Wissenschaften, 2020
This is a preparatory chapter giving the necessary standard background on smooth and complex mani... more This is a preparatory chapter giving the necessary standard background on smooth and complex manifolds and maps.
Singularity theory is a broad subject with vague boundaries. It draws on many other areas of math... more Singularity theory is a broad subject with vague boundaries. It draws on many other areas of mathematics, and in turn has contributed to many areas both within and outside mathematics, in particular differential and algebraic geometry, knot theory, differential equations, bifurcation theory, Hamiltonian mechanics, optics, robotics and computer vision. This volume consists of two dozen articles from some of the best known figures in singularity theory, and it presents an up-to-date survey of research in this area.
This talk will describe ongoing joint work with Paul Cadman and Duco van Straten, based on the Ph... more This talk will describe ongoing joint work with Paul Cadman and Duco van Straten, based on the PhD thesis of the former. Givental and Varchenko used the period mapping to pull back the intersection form on the Milnor fibre of an irreducible plane curve singularity $C$, and thereby define a symplectic structure on the base space of a miniversal deformation. We show how to combine this with a symmetric basis for the module of vector fields tangent to the discriminant, to produce involutive ideals $I_k$ which define the strata of parameter values $u$ such that $\delta(C_u)\leq k$. In the process we find an unexpected Lie algebra and a still mysterious canonical deformation of the module structure of the critical space over the discriminant. Much of this work is experimental - a crucial gap in understanding still needs bridging.
Grundlehren der mathematischen Wissenschaften, 2020
We introduce the alternating homology of a space with a symmetric group action, and give a new co... more We introduce the alternating homology of a space with a symmetric group action, and give a new construction of the image computing spectral sequence (ICSS), which computes the homology of the image of a finite map from the alternating homology of its multiple point spaces. We illustrate and motivate the ICSS with simple examples.
Symmetric lagrangian singularities and Gauss maps of theta divisors.- On infinitesimal deformatio... more Symmetric lagrangian singularities and Gauss maps of theta divisors.- On infinitesimal deformations of minimally elliptic singularities.- C-Regularite et trivialite topologique.- Folding maps and focal sets.- The dual graph for space curves.- On the components and discriminant of the versal base space of cyclic quotient singularities.- - equivalence and the equivalence of sections of images and discriminants.- Differential forms and hypersurface singularities.- Local reflexional and rotational symmetry in the plane.- The intersection form of a plane isolated line singularity.- On the degree of an equivariant map.- Automorphisms of direct products of algebroid spaces.- Disentanglements.- The euler characteristic of the disentanglement of the image of a corank 1 map germ.- Vanishing cycles for analytic maps.- On complete conditions in enumerative geometry.- Right-symmetry of mappings.- Deformations and the milnor number of non-isolated plane curve singularities.- Vanishing cycles and special fibres.- On the versal deformation of cyclic quotient singularities.- On Canny's roadmap algorithm: orienteering in semialgebraic sets (an application of singularity theory to theoretical robotics).- Elliptic complete intersection singularities.- Pencils of cubic curves and rational elliptic surfaces.
Grundlehren der mathematischen Wissenschaften, 2020
This is a preparatory chapter giving the necessary standard background on smooth and complex mani... more This is a preparatory chapter giving the necessary standard background on smooth and complex manifolds and maps.
Singularity theory is a broad subject with vague boundaries. It draws on many other areas of math... more Singularity theory is a broad subject with vague boundaries. It draws on many other areas of mathematics, and in turn has contributed to many areas both within and outside mathematics, in particular differential and algebraic geometry, knot theory, differential equations, bifurcation theory, Hamiltonian mechanics, optics, robotics and computer vision. This volume consists of two dozen articles from some of the best known figures in singularity theory, and it presents an up-to-date survey of research in this area.
This talk will describe ongoing joint work with Paul Cadman and Duco van Straten, based on the Ph... more This talk will describe ongoing joint work with Paul Cadman and Duco van Straten, based on the PhD thesis of the former. Givental and Varchenko used the period mapping to pull back the intersection form on the Milnor fibre of an irreducible plane curve singularity $C$, and thereby define a symplectic structure on the base space of a miniversal deformation. We show how to combine this with a symmetric basis for the module of vector fields tangent to the discriminant, to produce involutive ideals $I_k$ which define the strata of parameter values $u$ such that $\delta(C_u)\leq k$. In the process we find an unexpected Lie algebra and a still mysterious canonical deformation of the module structure of the critical space over the discriminant. Much of this work is experimental - a crucial gap in understanding still needs bridging.
Grundlehren der mathematischen Wissenschaften, 2020
We introduce the alternating homology of a space with a symmetric group action, and give a new co... more We introduce the alternating homology of a space with a symmetric group action, and give a new construction of the image computing spectral sequence (ICSS), which computes the homology of the image of a finite map from the alternating homology of its multiple point spaces. We illustrate and motivate the ICSS with simple examples.
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Papers by David Mond