APRIL 13 - APRIL 15, 2005 |
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| Princeton University Graduate Student Seminar | |
| Topic: | Nonstandard Analysis |
| Presenter: | Brian Street, Princeton University |
| Date: | Wednesday, April 13, 2005, Time: 12:30 p.m., Location: Fine Hall 314 |
| Abstract: | I will give a brief introduction to Abraham Robinson's nonstandard analysis. Nonstandard analysis can be applied to every area of mathematics, not just analysis. When applied to the real numbers it gives a theory of infinitely large and small real numbers, and these concepts can be generalized to any topological space. Among other things, this gives a nice characterization of compactness. In this talk, I will discuss the basic concepts of nonstandard analysis, and show how it may be applied to standard areas of mathematics. At the end, I will make some remarks on Nelson's internal set theory, and how nonstandard analysis can be used to develop mathematical theories that are interesting in their own right. The talk will be elementary, and require no special background. |
| Department Colloquium | |
| Topic: | The Inverse Problem in Invariant Theory |
| Presenter: | Michael Larsen, Indiana University |
| Date: | Wednesday, April 13, 2005, Time: 4:30 p.m., Location: Fine Hall 1201 |
| Abstract: | The direct problem in invariant theory is to describe the category of representations of a given group. Its inverse is to extract information about a group from information about its representations. The prototypical result in this direction is Tannaka duality. The ultimate goal is to recognize compact Lie groups which appear in nature, where in practice one typically does not know the category of representations up to isomorphism. |
| Operations Research and Financial Engineering Seminar *** Special series of lectures *** | |
| Topic: | Optimal stopping and free boundary problems |
| Presenter: | Albert N. Shiryaev, Moscow State University and Steklov Mathematical Institute, Russia |
| Date: | Wednesday, April 13, 2005, Time: 4:30 p.m., Location: Room E-225, Engineering Quad |
| Abstract: | Professor Shiryaev will discuss selected topics in: (A) the theory of probability: maximal inequalities in stochastic analysis, (B) the mathematical statistics: sequential testing and quickest detection problems for Wiener and Poisson processes, (C) the mathematical finance: American options (standard, Russian, Asian, power) which can be reformulated as problems of optimal stopping of stochastic processes and solved by a reduction to free-boundary problems of real analysis (Stefan problems). |
| PACM Colloquium - Distinguised Lecture Series | |
| Topic: | More Unknowns than Equations? Bring it on! |
| Presenter: | David Donoho, Department of Statistics, Stanford University |
| Date: | Wednesday, April 13, 2005, Time: 8:00 p.m., Location: A02 McDonnell Hall |
| Abstract: | Everything you were taught about underdetermined systems of linear equations is wrong... Okay, that's too strong. But you have been taught things in undergraduate linear algebra which, if you are an engineer or scientist, may be holding you back. The main one is that if you have more unknowns than equations, you're lost. Don't believe it. At the moment there are many interesting problems in the information sciences where researchers are currently confounding expectations by turning linear algebra upside down: (a) An imaging system can produce an accurate N-pixel image using only N^{1/4} log^3(N) (specially chosen) samples to reconstruct it, far fewer than the N pixel samples you might have naively thought. (b) A Fourier imaging system can observe just the lowest frequencies of a sparse nonnegative signal and perfectly reconstruct all the unmeasured high frequencies of the signal. (c) a communications system can transmit a very weak signal perfectly in the presence of intermittent but arbitrarily powerful jamming. <\p> Moreover, in each case the methods are convenient and computationally tractable. Mathematically, what's going on is a recent explosion of interest in finding the sparsest solution to certain systems of underdetermined linear equations. This problem is known to be NP-Hard in general, and hence the problem sounds intractable. Surprisingly, in some particular cases, it has been found that one can find the sparsest solution by $l^1$ minimization, which is a convex optimization problem and so tractable. Many researchers are now actively working to explain and exploit this phenomenon. It's responsible for the examples given above. In my talk, I'll discuss that this curious behavior of $l^1$ minimization and connect with some deep mathematics and a broad range of fun applications. |
| Ergodic Theory and Statistical Mechanics Seminar ***Please note two speakers | |
| Topic: | An estimate on the size of a neighborhood of a level set in R^n |
| Presenter: | Pavel Batchourine, Princeton University |
| Abstract: | I will show an elementary estimate on the volume of a neighborhood of a level set of a regular function in R^n and indicate why such an estimate is important in the proof of ergodicity of hyperbolic billiards. This is a joint work with Ch. Fefferman. |
AND |
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| Topic: | Constructing weakly mixing interval exchange transformations |
| Presenter: | Corinna Ulcigrai, Princeton University |
| Abstract: | In this talk we discuss an approach to weak mixing of an Interval Exchange Transformation (IET) which, in a special class of IETs (the ones with periodic Rauzy-Veech-Zorich expansion) allows us to construct explicit examples of weakly mixing IETs. Weak mixing is checked by computing numerically a certain Galois group. |
| Date: | Thursday, April 14, 2005, Time: 2:00 p.m., Location: Fine Hall 322 |
| Joint Analysis Seminar | |
| Topic: | On L_{3, \infty} solutions to the Navier-Stokes equations and backward uniqueness |
| Presenter: | Vladimir Sverak, University of Minnesota |
| Date: | Thursday, April 14, 2005, Time: 4:00 p.m., Location: Fine Hall 214 |
| Topology Seminar | |
| Topic: | The Reduced Algebraic K-theory of Square-Zero Extensions by Free Modules |
| Presenter: | Ayelet Lindenstrauss, Indiana University |
| Date: | Thursday, April 14, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: | This talk is about joint work with Randy McCarthy (UIUC). We give a method for finding the completion at a prime p of the reduced (over A) K-theory of the square-zero extension of A by a free A-module of finite rank, $\tilde K(A \semiprod (A^{\oplus k}))^\wedge _p$. The calculation is carried out when $A$ satisfies a technical condition which (by work of Hesselholt and Madsen) is satisfied by perfect fields of characteristic $p$, and in that case generalizes the dual numbers ($k=1$) case which Hesselholt and Madsen calculate by different methods. Our calculation uses an invariant we call $W(A;M)$, which can be thought of as a Witt ring of $A$ with coefficients in $M$, or alternatively as cyclic homology of $A$ with coefficients in $M$. By Goodwillie calculus methods, $\tilde K (A \semiprod M) \simeq W(A;M\otimes S1)$, so what we actually study is $W(A; A^{\oplus k}\otimes S1)$. The completion at $p$ is needed for a topological analog of breaking the Witt ring down into a product of $p$-Witt vectors. |
| Joint Institute for Advanced Study and Princeton University Number Theory Seminar *** Please note special date, time, and location | |
| Topic: | The inverse Galois problem for p-adic Lie algebras |
| Presenter: | Michael Larsen, Indiana University |
| Date: | Friday, April 15, 2005, Time: 2:00 p.m., Location: Fine Hall 801 |
| Abstract: | For a number field K and a (compact) p-adic Lie groups G, the inverse Galois problem asks whether G can be realized as the Galois group of an extension of K. Already in the case that G is zero-dimensional, this is too difficult. So I propose to relax the problem and ask which p-adic Lie algebras can be realized. |
| Geometric Analysis Seminar | |
| Topic: | Minimal Desingularizations of Planes in Space |
| Presenter: | Michael Wolf, Rice University |
| Date: | Friday, April 15, 2005, Time: 3:00 p.m., Location: Fine Hall 314 |
| Abstract: | We prove that there is only one way to 'desingularize' the intersection of two planes in space to and obtain a periodic minimal surface as a result. The proof is mostly an exercise in Teichmuller theory: we translate the geometry of minimal surface in space into a statement about a moduli space of flat structures on Riemann surfaces, and thenstudy deformation theory and degenerations in this moduli space to prove the result. |
| Geometry, Representation Theory, and Moduli Seminar | |
| Topic: | Relative Gromov-Witten Invariants and Symplectic Field Theory |
| Presenter: | E. Katz, Duke University |
| Date: | Friday, April 15, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
APRIL 18 - APRIL 22, 2005 |
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| Joint Analysis Seminar *** Please note special date and location | |
| Topic: | Existence of solutions to the nonlinear wave equation with an inverse-square potential |
| Presenter: | Paschalis Karageorgis, Northwestern University |
| Date: | Monday, April 18, 2005, Time: 4:00 p.m., Location: Fine Hall 314 |
| Abstract: | Focusing on the nonlinear wave equation with an inverse-square potential, we address the existence of solutions under assumptions which are optimal in some sense. In particular, the well-known theorem of Fritz John for a zero potential is shown to hold for potentials which are not necessarily small or positive. |
| PACM Colloquium | |
| Topic: | Modeling of large-scale neuronal network dynamics |
| Presenter: | David Cai, New York University |
| Date: | Monday, April 18, 2005, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: | It has been shown experimentally that spontaneous cortical activity in the absence of sensory inputs modulates stimulus-evoked activity and is correlated with behavior. In the visual cortex, there is a close relationship between ongoing spontaneous activity and the spontaneous firing of a single neuron. There are dynamic switchings amongst these spontaneous cortical states, which may span several hypercolumns spatially and are closely associated to orientation maps. To study theoretically these spatially coherent patterns of spontaneous activity, which emerge in a fluctuation-dominated neuronal network with anisotropic long-range cortical couplings in addition to isotropic short-range interactions, we have developed a coarse-grained representation of neuronal network dynamics in terms of (1+1)-D kinetic equations, which are derived via a novel moment closure, directly from the original large-scale integrate-and-fire (I&F) network. This powerful kinetic theory captures the full dynamic range of neuronal networks — from the mean-driven limit (a limit such as the number of neurons $N\rightarrow\infty$, in which the fluctuations vanish) to the fluctuation-dominated limit (such as in small N networks or sparsely connected networks). Both analytical insights and scale-up of numerical representation can be achieved via this kinetic approach. We illustrate the power of the theory by studies of the dynamical properties of networks of various architectures, including excitatory and inhibitory neurons of both simple and complex type, which exhibit rich dynamic phenomena, such as, transitions to bistability and hysteresis, even in the presence of large fluctuations. To overcome the loss of detailed spike information in many coarse-grained procedures, we have further developed a hybrid theoretical framework to retain spike information by embedding a sub-network of point neurons within, and fully interacting with, a coarse-grained network of dynamical background. Comparison with full numerical simulations of the original I&F network establishes that our kinetic theory and embedded network approach are dynamically very accurate and numerically extremely efficient. |
| Joint Institute for Advanced Study and Princeton University Number Theory Seminar | |
| Topic: | Equidistribution for Hecke eigenforms |
| Presenter: | Wenzhi Luo, Ohio State University |
| Date: | Monday, April 18, 2005, Time: 4:30 p.m., Location: Fine Hall 322 |
| Abstract: | In this talk, I'd like to describe my recent work with P.Sarnak concerning the equidistribution properties for Hecke eigenforms on the modular surface. We evaluate asymptotically the variance for the equidistribution by means of the trace formula and analyze its subtle arithmetic structure and connections to Hecke operators and central values of triple product L-functions. |
| Group Actions and Automorphic Forms Seminar | |
| Topic: | Ergodic theory of semisimple lattices |
| Presenter: | Alexander Gorodnik, Caltech |
| Date: | Tuesday, April 19, 2005, Time: 11:30 a.m., Location: Fine Hall PL |
| Abstract: | Consider a measure-preserving action of a lattice (in semisimple Lie group) on a probability measure space. For such actions, we prove strong maximal inequality, mean and pointwise ergodic theorems. For lattices satisfying property (T), we get ergodic theorems with exponential rate of convergence. In the case of algebraic lattice actions that preserve finite measure, we show that all dense orbits are equidistributed. Our methods can be also applied to some infinite volume homogeneous spaces. This is joint work with Amos Nevo and Barak Weiss. |
| Algebraic Geometry Seminar | |
| Topic: | Algebraic methods in the theory of finite type domains |
| Presenter: | Gordon Heier, Harvard University |
| Date: | Tuesday, April 19, 2005, Time: 4:30 p.m., Location: Fine Hall 322 |
| Abstract: | We will report on results on finite type domains in $\mathbb{C}^n$ obtained by applying algebraic geometric methods. These results will mainly concern the selection of curves with maximal touching order (joint with R. Lazarsfeld) and the local behavior of the numerical value of the type (shedding new light on J. D'Angelo's effective local boundedness theorem). If time permits, we will also explain recent work on effective subelliptic estimates using multiplier ideal sheaves (joint with I. Coskun and A. Nicoara). |
| Operations Research and Financial Engineering Seminar | |
| Topic: | Smoothly Truncated Stable Distributions, GARCH-Models, and Option Pricing |
| Presenter: | Christian Menn, Cornell University |
| Date: | Tuesday, April 19, 2005, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| Abstract: | Click here |
| Discrete Mathematics Seminar | |
| Topic: | Clique-width for graph classes defined by forbidden four-vertex subgraphs |
| Presenter: | Andreas Brandstaed, University of Rostock |
| Date: | Wednesday, April 20, 2005, Time: 2:15 p.m., Location: Fine Hall 224 |
| Abstract: | Click here |
| Department Colloquium | |
| Topic: | Probabilistic reasoning and Ramsey Theory |
| Presenter: | Benjamin Sudakov, Princeton University |
| Date: | Wednesday, April 20, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: | "Ramsey Theory" refers to a large body of deep results in mathematics concerning the partition of large collections. Its underlying philosophy is captured succinctly by the statement that "In a large system complete disorder is impossible". Since the publication of the seminal paper of Ramsey in 1930, this subject has grown with increasing vitality, and is currently among the most active areas in Combinatorics. An important factor in the development of Ramsey Theory was the successful application of the so-called "Probabilistic Method". This method was initiated more than fifty years ago by Paul Erdos, and became one of the most powerful and widely used tools in Discrete Mathematics. In this talk I will describe some classical results of Ramsey Theory together with recent progress on some old questions of Erdos which was made using probabilistic arguments. I will also discuss the problem of converting existence arguments into deterministic constructions, in particular, the recent explicit constructions of Bipartite Ramsey graphs. |
| Topology Seminar | |
| Topic: | Higher-rank Donaldson invariants for four-manifolds |
| Presenter: | Peter Kronheimer, Harvard University |
| Date: | Thursday, April 21, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
| Joint Institute for Advanced Study and Princeton University Number Theory Seminar | |
| Topic: | TBA |
| Presenter: | Fred Diamond, Brandeis University |
| Date: | Friday, April 22, 2005, Time: 2:00 p.m., Location: Fine Hall 801 |
| Geometric Analysis Seminar | |
| Topic: | The structure of singularities of mean curvature flow |
| Presenter: | Bruce Kleiner, University of Michigan |
| Date: | Friday, April 22, 2005, Time: 3:00 p.m., Location: Fine Hall 314 |
| Geometric Analysis Seminar *** Please note special time and location | |
| Topic: | Spectral invariants on surfaces and Markov Chains |
| Presenter: | Jean Steiner, Courant Institute |
| Date: | Friday, April 22, 2005, Time: 4:30 p.m., Location: Fine Hall 214 |
| Abstract: | In this talk we will consider Green's functions on surfaces and on discrete Markov chains. In both settings, the regularized trace of the Laplacian emerges as an interesting spectral invariant, and we will consider relevant analogies and probabilistic interpretations. |
| Geometry, Representation Theory, and Moduli Seminar | |
| Topic: | TBA |
| Presenter: | Maryam Mirzakhani, Princeton University |
| Date: | Friday, April 22, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
APRIL 25 - APRIL 29, 2005 |
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| Operations Research and Financial Engineering Seminar *** Special series of lectures *** | |
| Topic: | Jump diffusion models with applications in credit risk and option pricing |
| Presenter: | Steve Kou, Columbia University |
| Date: | Monday, April 25, 2005, Time: 3:00 p.m., Location: Room E-225, Engineering Quad |
| Abstract: | The topics to be covered include: (1) Modeling credit spread, implied volatility, optimal capital structure with endogenous default and jump risk (2) First passage times for jump diffusion processes (3) Analytical approximations for finite-maturity American options. (4) Analytical solutions for barrier and lookback options. |
| PACM Colloquium | |
| Topic: | Discrete Denoising |
| Presenter: | Sergio Verdu, Applied Mathematics and Electrical Engineering, Princeton University |
| Date: | Monday, April 25, 2005, Time: 4:00 p.m., Location: Fine Hall 214 |
| Abstract: | Finite-alphabet signals corrupted by discrete noisy channels arise naturally in a wide range of applications spanning fields such as statistics, engineering, and computer science. Examples include DNA sequence analysis and processing, text correction, Hidden Markov model state estimation, and image denoising. While the field of filtering or denoising of continuous-alphabet signals has a long history, the field of discrete denoising has seen far less progress. In many discrete denoising applications, a good model for the randomness of the noisy channel is known, whereas the statistical description of the noiseless signal is either unknown or too complex. It is therefore of considerable interest to pose the problem of discrete universal denoising where no knowledge exists about the statistics of the noiseless signal while the channel statistics are assumed known. I will present the DUDE algorithm for discrete universal denoising which has linear complexity and attains universal optimality in a stochastic sense as well as a stronger semi-stochastic sense. I will also show several DUDE-based algorithms for channel decoding of systematically encoded redundant data. Joint work with E. Ordentlich, G. Seroussi, M. Weinberger and T. Weissman. |
| Operations Research and Financial Engineering Seminar | |
| Topic: | Stochastic Gradient Estimation |
| Presenter: | Michael Fu, University of Maryland |
| Date: | Tuesday, April 26, 2005, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| Abstract: | We survey the methods of stochastic gradient estimation, including perturbation analysis, the likelihood ratio method, and weak derivatives. We illustrate the techniques using models in queueing, inventory, and finance. In the latter case, the methods can be used for estimating the so-called Greeks, which are crucial for hedging, and also for pricing American-style options (derivatives with early exercise opportunities). Computational examples using the estimators in stochastic approximation algorithms are described. |
| Operations Research and Financial Engineering Seminar *** Special series of lectures *** | |
| Topic: | Jump diffusion models with applications in credit risk and option pricing |
| Presenter: | Steve Kou, Columbia University |
| Date: | Wednesday, April 27, 2005, Time: 3:00 p.m., Location: Room E-225, Engineering Quad |
| Abstract: | The topics to be covered include: (1) Modeling credit spread, implied volatility, optimal capital structure with endogenous default and jump risk (2) First passage times for jump diffusion processes (3) Analytical approximations for finite-maturity American options. (4) Analytical solutions for barrier and lookback options. |
| Ergodic Theory and Statistical Mechanics Seminar | |
| Topic: | A GUE central limit theorem and universality of last passage percolation passage times in thin rectangles |
| Presenter: | Toufic Suidan, Courant Institute |
| Abstract: | I will discuss a central limit theorem whose limit is the Gaussian unitary ensemble Tracy-Widom distribution. This CLT is intimately related to first and last passage percolation problems. In addition, I will discuss the O'Connell-Yor procedure and it's relation to the Tracy-Widom top n eigenvalue joint distribution. This is joint work with Jinho Baik. |
| Date: | Thursday, April 28, 2005, Time: 2:00 p.m., Location: Fine Hall 322 |
| Joint Analysis Seminar | |
| Topic: | TBA |
| Presenter: | Igor Rodnianski, Princeton University |
| Date: | Thursday, April 28, 2005, Time: 4:00 p.m., Location: Fine Hall 214 |
| Topology Seminar | |
| Topic: | TBA |
| Presenter: | Helmut Hofer, NYU |
| Date: | Thursday, April 28, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
| Operations Research and Financial Engineering Seminar *** Special series of lectures *** | |
| Topic: | Jump diffusion models with applications in credit risk and option pricing |
| Presenter: | Steve Kou, Columbia University |
| Date: | Friday, April 29, 2005, Time: 11:30 a.m., Location: Room E-225, Engineering Quad |
| Abstract: | The topics to be covered include: (1) Modeling credit spread, implied volatility, optimal capital structure with endogenous default and jump risk (2) First passage times for jump diffusion processes (3) Analytical approximations for finite-maturity American options. (4) Analytical solutions for barrier and lookback options. |
| Geometric Analysis Seminar | |
| Topic: | Ricci flow on locally homogeneous closed 4-manifolds |
| Presenter: | Peng Lu, University of Oregon |
| Date: | Friday, April 29, 2005, Time: 3:00 p.m., Location: Fine Hall 314 |
| Abstract: | We discuss the Ricci flow on homogeneous 4-manifolds. After list the classification these manifolds, we show that there are families of initial metrics such that we can diagonalize them and the Ricci flow preserves the diagonalization, then we analyze the long time behavior of these families. |
| Geometric Analysis Seminar *** Note special time | |
| Topic: | Combinatorial Yamabe flow |
| Presenter: | David Glickenstein, MIT |
| Date: | Friday, April 29, 2005, Time: 4:30 p.m., Location: Fine Hall 314 |
| Abstract: | We shall study a piecewise-linear geometry which lies somewhere between the geometry of graphs and the geometry of Riemannian manifolds. In our context, the geometry comes from a simplicial complex whose vertices are given weights which determine the lengths of edges (so the vertices and edges form a weighted graph), and hence the area and volume of higher dimensional simplices. Combinatorial Yamabe flow is a way to deform the geometry into something less complicated via an ordinary differential equation, an analogue of the Ricci or Yamabe flow in Riemannian geometry designed for a piecewise-linear object instead of a smooth manifold. Such equations may be helpful in applying the successful methods of geometric evolution equations to new realms of problems in physics, topology, algebraic geometry, numerical analysis, graph theory, and other fields. The methods will involve basic Euclidean geometry as well as the application of simple ideas from partial differential equations to functions on graphs. This talk will be self-contained and should be easily accessible to graduate students and those in other fields. |
MAY 2 - MAY 6, 2005 |
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| Joint Analysis Seminar | |
| Topic: | TBA |
| Presenter: | Markus Keel, University of Minnesota |
| Date: | Thursday, May 5, 2005, Time: 4:00 p.m., Location: Fine Hall 214 |
MAY 9 - MAY 14, 2005 |
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| Operations Research and Financial Engineering Seminar | |
| Topic: | On the borders of Statistics and Computer Science |
| Presenter: | Peter Bickel, University of California, Berkeley |
| Date: | Tuesday, May 10, 2005, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |
| Abstract: | Machine learning in computer science and prediction and classification in statistics are essentially equivalent fields. I will try to illustrate the relation between theory and practice in this huge area by a few examples and results. In particular I will try to address an apparent puzzle: Worst case analyses, using empirical process theory, seem to suggest that even for moderate data dimension and reasonable sample sizes good prediction (supervised learning) should be very difficult. On the other hand, practice seems to indicate that even when the number of dimensions is very much higher than the number of observations, we can often do very well. We also discuss a new method of dimension estimation and some features of cross validation. |
| Joint Institute for Advanced Study and Princeton University Number Theory Seminar *** Please note special date, time, and location | |
| Topic: | From Laplace to Langlands via Restriction from SO(2n+1) to SO(2n) |
| Presenter: | Benedict Gross, Harvard University |
| Date: | Thursday, May 12, 2005, Time: 1:30 p.m., Location: Fine Hall 314 |
| Mathematical Physics Seminar *** Please note special date, time, and location | |
| Topic: | On a Class of Exactly Integrable Radial Solutions of the Continuity and Euler Equations for nD systems with Long Range Interactions |
| Presenter: | Philippe Choquard, Institute of Theoretical Physics, Lausanne |
| Date: | Friday, May 13, 2005, Time: 3:00 p.m., Location: Jadwin Hall 343 |
| Abstract: | Hamiltonian fluids with Newtonian or Coulombian self-interactions in nD are considered. Exact integrability of radial solutions of the corresponding Euler, Poisson and continuity equations is shown to result from the existence of two constants of integration. Representative examples of implicit solutions are given for the pure attractive and repulsive systems for the models with homogenous and compensating background densities, i.e., the One Component Plasma and the model of Cold Dark Matter in an expanding universe. |
MAY 16 - MAY 20, 2005 |
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| Operations Research and Financial Engineering Seminar *** Please note special day | |
| Topic: | TBA |
| Presenter | Holger Dette, Ruhr-Universität Bochum, Germany |
| Date: | Monday, May 16, 2005, Time: 4:30 p.m., Location: Room E-219, Engineering Quad |