# Chaos And Nonlinear Dynamics by Hilborn R C By Hilborn R C

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Finally, in the sequence of figures (rectangles and circle sectors) forming the tube, the rear side of the preceding figure coincides with the front side of the subsequent figure, and there are no other points of pairwise intersection of the figures. 34 2 Problem of Minimum Resistance to Translational Motion of Bodies It may happen, in particular, that the tube is a single v-rectangle; in this case its upper side is the front one, the lower side is the rear one, and the length of these sides is 2"3 .

A major step forward was made in the 1990s, when unexpected and striking results were obtained for some classes of nonaxisymmetric bodies and, later, for nonconvex bodies [8, 11, 12, 16–18, 29– 31]). However, the authors kept the initial assumption that the body must have a fixed length and width, that is, can be inscribed in a fixed right circular cylinder. A further constraint imposed on all classes of bodies was as follows. A particle cannot hit a body more than once. Here we do not impose this constraint.

0; 1/. B" / D 0. In what follows, we will write R instead of Rv , omitting the subscript v. BQ " / D 0. BQ " / ! 0 as " ! 0. 2). Consider the partition of R2 into (closed) squares of size 2 2 with vertices in 2Z 2Z and denote by D the union of squares contained in the interior of C2 . One easily sees that C1 D. The squares of the partition that are contained in D and have nonempty intersection with @D will be called boundary squares. The boundary squares do not intersect C1 . Indeed, each boundary square (let it be Q) has a nonempty intersection with another square of a partition (say, Q0 ) that does not belong to D.