By Alexandre Joel Chorin (auth.), Alexandre J. Chorin, Andrew J. Majda (eds.)

The sixtieth birthday of Peter Lax used to be celebrated at Berkeley via a convention entitled Wave Motion: thought, software and computation held on the mathematical Sciences learn Institute, June 9-12, 1986. Peter Lax has made profound and crucial contributions to the subjects defined through the name of the convention, and has additionally contributed in vital how one can many different mathematical topics, and for this reason this convention quantity devoted to him comprises examine paintings on various subject matters, no longer all sincerely relating to its title.

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Extra info for Wave Motion: Theory, Modelling, and Computation: Proceedings of a Conference in Honor of the 60th Birthday of Peter D. Lax

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3) p(B + 2ft»/q) On account of the symmetry =p(9). By the definitions of rin and rout it follows that both p(9) - rin and p(9) - rout vanish somewhere. 3) it follows that the zeros of these functions are separated by less than ft. 5) rL - A - I\"vr2 ~ 1/2[(q/2v}2_11 57 2 I\" V [ (p-r}2de for r E [rin,routl.

Hence the new parametrization satisfies a differential equation in which only the tangential component of the velocity vector has been changed; one still has J(W,T) = 8(U(W,T),T), so that 8 and J have the same values at the same point on the curve considered as a subset of 1R2. To see that any function 22 a(W,T) can be obtained by an appropriate choice of the function u, we let u(w,O) = uO(w): [O,a] - [O,b] be an arbitrary parametrization of the ori,inal curve with uO(O) ua(a) = band dUO/dw positive.

1. 3 The Final ~ for Bmbedded Convex Curve. 1) for all time. curve is an embedded convex curve (p = 1) and that a solution exists on the time interval [O,T). Here T = AO/2" (positive) area enclosed by the initial curve. 7 we have that m A(t) = 0; under these assumptions we will show that the curve t-+T shrinks to a point with asymptotically circular shape: I f the curve shortening evolution exists until the area goes to iero then a convex embedded curve converges smoothlll to a shrinking circle.

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