By Helene Barcelo, Gil Kalai

This ebook includes twenty-two papers provided on the foreign convention in Combinatorics, held in Jerusalem in could 1993. The papers describe many of the most recent advancements in algebraic combinatorics, enumeration, graph and hypergraph idea, combinatorial geometry, and geometry of polytopes and preparations. The papers are available to experts in addition to nonspecialists

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**Extra info for Jerusalem Combinatorics '93: An International Conference in Combinatorics, May 9-17, 1993, Jerusalem, Israel**

**Sample text**

1. 5, we can match the point (q, d) below the hypotenuse with the point (4 − q, 10 − d) above the hypotenuse. The three integer pairs (q, d) on the hypotenuse correspond to the three ways to make a dollar using just quarters and dimes. 5. 6 interprets our third solution to the dollar-changing question in a manner that resembles our approximation technique for the orchard’s area. 6: Integer pairs and unit squares triangle is the center of a shaded unit square. The number of ways to make change for a dollar is thus the total area of the unit squares.

Make diagonal cuts within each piece (the thin lines in the ﬁgure) so that all of the pizza pieces are triangles. The resulting conﬁguration is a triangulated polygon. Let there be B boundary vertices, I interior vertices, E edges, and T triangles. 19: The pizza is trimmed and triangulated of vertices is V = I + B. (a) Explain why 2E = 3T + B. 7), we discuss the triangulated polygon theorem, which asserts that T = 2I + B − 1. Use this result to show that E = 3I + 2B − 3. (c) Show that the triangulated polygon satisﬁes the Euler relation T = E − V + 1.

This situation can always be circumvented by rotating the pizza slightly at the outset. 3), we count the vertices and edges in an optimal conﬁguration of cuts. There are 2n boundary vertices and n(n − 1)/2 interior vertices. Also, there are 2n curved edges on the boundary of the pizza, and each of the n cuts contains n straight edges. Therefore, v = 2n + n(n − 1) 2 and e = 2n + n2 . 3) and ﬁnd that the maximum number of pizza pieces with n cuts is the familiar expression p = (n2 + n + 2)/2. 7 Euler’s Formula for Plane Graphs The preceding solution to the pizza-cutter’s problem has brought us to the doorstep of an important formula discovered by the great Swiss mathematician Leonhard Euler (1707–1783).