Contests in Higher Mathematics: Miklós Schweitzer by Gabor J. Szekely

By Gabor J. Szekely

Some of the most potent how one can stimulate scholars to get pleasure from highbrow efforts is the clinical festival. In 1894 the Hungarian Mathematical and actual Society brought a mathematical festival for prime institution scholars. The luck of highschool competitions led the Mathematical Society to came upon a school point contest, named after Miklós Schweitzer. the issues of the Schweitzer Contests are proposed and chosen via the main admired Hungarian mathematicians. This ebook collects the issues posed within the contests among 1962 and 1991 which diversity from algebra, combinatorics, thought of services, geometry, degree idea, quantity concept, operator conception, chance thought, topology, to set concept. the second one half comprises the recommendations. The Schweitzer festival is without doubt one of the most original on this planet. The event indicates that this pageant is helping to spot study skills. This number of difficulties and ideas in numerous fields in arithmetic can function a consultant for plenty of undergraduates and younger mathematicians. the big number of learn point difficulties can be of curiosity for extra mature mathematicians and historians of arithmetic in addition.

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Extra resources for Contests in Higher Mathematics: Miklós Schweitzer Competitions, 1962-1991 (Problem Books in Mathematics)

Example text

9) [A. Csasz6x] 9. Let A be a closed and bounded set in the plane, and let C denote the set of points at a unit distance from A. Let p E C, and assume that the intersection of A with the unit circle K centered at p can be covered by an arc shorter than a semicircle of K. Prove that the intersection of C with a suitable neighborhood of p is a simple arc of which p is not an endpoint. 10) [M. Bognar] 10. Let It and v be two probability measures on the Borel sets of the plane. Prove that there are random variables S1, 2, r11,172 such that (a) the distribution of (t1i 2) is p and the distribution of (771,712) is v, (b) 1 < 771, 2 < 772 almost everywhere, if and only if p(G) > v(G) for all sets of the form G = U,=1 (-oo, xi) x (-oo, yz).

Show that the sum of the perimeters of the circles is at most -7r / (the lines are not allowed to cut the interior of a subpolygon). 30) [G. and L. Fejes-Toth] 1. PROBLEMS OF THE CONTESTS 31 10. Suppose that the T3-space X has no isolated points and that in X any family of pairwise disjoint, nonempty, open sets is countable. Prove that X can be covered by at most continuum many nowhere-dense sets. 13) [I. Juhasz] 1981 1. We are given an infinite sequence of 1's and 2's with the following properties: (1) The first element of the sequence is 1.

Prove that X is a union of at most N, compact subspaces. 16) [Z. Balogh] 10. Let P be a probability distribution defined on the Borel sets of the real line. Suppose that P is symmetric with respect to the origin, absolutely continous with respect to the Lebesgue measure, and its density function p is zero outside the interval [-1, 1] and inside this interval it is between the positive numbers c and d (c < d). Prove that there is no distribution whose convolution square equals P. 20) IT. F. M6ri, G.

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