By Fabrice Bethuel, Gerhard Huisken, Stefan Müller, Klaus Steffen (auth.), Stefan Hildebrandt, Michael Struwe (eds.)

The foreign summer season institution on Calculus of adaptations and Geometric Evolution difficulties was once held at Cetraro, Italy, 1996. The contributions to this quantity mirror rather heavily the lectures given at Cetraro that have supplied a picture of a pretty vast box in research the place in recent times we've seen many very important contributions. one of the issues handled within the classes have been variational tools for Ginzburg-Landau equations, variational types for microstructure and part transitions, a variational therapy of the Plateau challenge for surfaces of prescribed suggest curvature in Riemannian manifolds - either from the classical standpoint and within the environment of geometric degree theory.

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**Additional info for Calculus of Variations and Geometric Evolution Problems: Lectures given at the 2nd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Cetraro, Italy, June 15–22, 1996**

**Example text**

Moreover, if u is a solution corresponding to c, we conjecture that the set where u vanishes converges as e --* 0 to two geodesics on (5 '3, h) which are linked. We hope this quite of ideas to lead to new geometrical properties. vii. THE HEAT FLOW Consider f~ a smooth bounded domain in IR2 and g a smooth S I - v a l u e d map from 38 0~"~ to S 1, The heat flow equation for the Ginzburg-Landau equation writes Ou (44) 1 - A u = --e2u (1 - lul ~) u(t,x)=g u(0, ~) Vt>_O, V x E O a ~0(x) = o n [0, + o o [ • v 9 e a, where u : [0, +cx~[• f't ~ ]R2, and the initial data u0 is smooth and in H i.

The Gauss-Kroncckcr curvaturc by K := d e t ( W ) = det{h}} - det(h,~} det{gi~} - ,~l . . . )~,,, the total curvature by ]A[2 : = t r ( W t W ) , ~ = h i i h q = g ik g i, hilh~a = ,~ + . . + ~ , = ttjl~ and the scalar curvature (ill Euclidean space 1R"+l) by R = II 2 - ]A[ ~ = 2(~1A2 + )~Aa + " " + )~,-~)~,,). More general, the mixcd mean curw~turcs S , , , 1 _< m __< n, arc given by thc clcmcntary symmetric flmctions of the A~, il("'(im such that $1 = H, 5'2 = (1/2)R, S,, = G. harmonic mean curvature Other interesting invariants include the f l := (~i-I + .

Here however a satisfies a better b o u n d than (42), since it is close to the minimum value ~,, and as for minimizers, we m a y prove that all vortices have degree +1 (and hence, that their number is exactly d). More precisely, among the collection ( a l , . . ,ad and a radius p satisfying p < r (where/~ is some constant 0 < / 1 < 1) such that luh(x)l >_ ~1 d ona\UB(ai,p) /=1 u h deg(v~,OB(ai,p)) Moreover, one =+1. has d i s t ( a i , a i ) _> #2, Vi#j, where #2 is some constant. Finally arguing as previously we may prove that the map q5 : E " ~ 2 , u ---* O(u) = ( a l , .