By Pavel Etingof, Shlomo Gelaki, Steven Shnider
The papers during this quantity are according to the talks given on the convention on quantum teams devoted to the reminiscence of Joseph Donin, which was once held on the Technion Institute, Haifa, Israel in July 2004. A survey of Donin's distinctive mathematical profession is incorporated. a number of articles, that have been without delay inspired via the study of Donin and his colleagues, care for invariant quantization, dynamical $R$-matrices, Poisson homogeneous areas, and mirrored image equation algebras. the themes of different articles comprise Hecke symmetries, orbifolds, set-theoretic ideas to the pentagon equations, representations of quantum present algebras, unipotent crystals, the Springer solution, the Fourier remodel on Hopf algebras, and, as a metamorphosis of velocity, the combinatorics of easily knotted surfaces. The articles all include vital new contributions to their respective components and may be of significant curiosity to graduate scholars and examine mathematicians attracted to Hopf algebras, quantum teams, and purposes. details for our vendors: This booklet is copublished with Bar-Ilan college (Ramat-Gan, Israel)
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Additional info for Quantum Groups: Israel Mathematical Conference Proceedings, Proceedings of a Conference in Memory of Joseph Donin, July 5-12, 2004, Technion-israel Institute of Techn
The situation when the mass is created in the whole bulk of the fluid is rather unusual. Usually the density A of a distribution of sources is non-zero only in some localized volume L\ V, while it vanishes in the rest of the fluid. If one has no interest in the details of motion inside the volume L\ V and studies the motion only outside it then the useful mathematical idealization of a point source of mass can be introduced. This can be done by means of a limiting procedure. Consider the simple case when in the fluid of homogeneous density A = const =F 0 only in the small volume L\ V, while A = 0 outside this 48 INTRODUCTION TO VORTEX DYNAMICS region.
Instead of salt and fresh water, one can use immiscible liquids to create a two-layer stratification. 5 g cm - 3) carbon tetrachloride (CCI 4 ) with low viscosity (v*=5 x 1O- 3 cm 2 s- 1) and lighter but more viscous aqueous glycerol. The viscosity of an aqueous solution of glycerol depends strongly on the concentration of glycerol and can easily be varied over a wide range. A suitable value for our experiments is v = (3-5) X 10- 2 cm 2 S-l, corresponding to a dilute solution. 5 cm) layer of the prepared solution lying on a thick (2-3 cm) layer of carbon tetrachloride allows one to generate a nearly two-dimensional flow in the upper layer.
There are many reasons why it is convenient to describe rotational flows in terms of the vorticity. 14): oco -+ ot Vx(u·V)u=v~co. INTRODUCTION TO VORTEX DYNAMICS 54 Note that the pressure is eliminated in this operation because the curl of a gradient vanishes. Since the divergence of a curl also vanishes, the vorticity of any flow must satisfy V· w= 0. 21) which is called the Helmholtz equation for the vorticity. In planar flows when u = (u 1, U2' 0) and the motion does not depend on the third coordinate X3 the vorticity vector has only one component w = (0,0, w), normal to the plane of motion.