By Ian Stewart

Welcome to Ian Stewart's unusual and magical international of arithmetic! In Math Hysteria, Professor Stewart offers us with a wealth of magical puzzles, every one spun round an awesome story: Counting the farm animals of the solar; the nice Drain theft; and Preposterous Piratical Predicaments; to call yet a couple of. alongside the way in which, we additionally meet many curious characters: in brief, those tales are attractive, difficult, and plenty of enjoyable!

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**Example text**

Notice that in our original definition of a walk, the beginning and ending vertices had no restrictions, so they could actually have been the same vertex. So now we define a special walk that does start and end at the same vertex and has no repeated edges. 8. A circuit is a walk with at least one edge that begins and ends at the same vertex and never uses the same edge twice. 26. V; E/, the K¨onigsberg Bridge Problem graph. Find at least one circuit that contains at least one repeated vertex (other than the initial/final vertex).

13. Let G be a graph. Then a subtree T of G is a maximal tree if and only if for any edge of G not in T , adding it to T produces a subgraph that is not a tree. 5. W [ fvg [ fwg; F [ feg/ is not a tree. 45. A subtree T in a connected graph G is a maximal tree if and only if T contains every vertex of G. 5 Planarity Earlier, we ran across the issue of whether we could draw a graph in the plane without having edges cross. If a graph can be drawn without edges crossing, we can often use geometric insights to deduce features about the graph.

You can put the Sternbucks anywhere you like; try several locations. Does the starting place affect the answer? If we can trace one visual representation of the K¨onigsberg Bridge graph, we can trace any correct representation, which is why we can abuse language and talk about the (visual representation of the) graph when working on this problem. V; E/. 16. V; E/, without reference to a visual representation of K. The K¨onigsberg Bridge Problem was modeled by a graph, and its challenge was described in terms of a tracing problem.