By W. D. Wallis, Alison M. Marr

ISBN-10: 0817683909

ISBN-13: 9780817683900

Magic squares are one of the extra well known mathematical recreations. over the past 50 years, many generalizations of “magic” rules were utilized to graphs. lately there was a resurgence of curiosity in “magic labelings” as a result of a few effects that experience purposes to the matter of decomposing graphs into bushes.

Key beneficial properties of this moment version include:

· a brand new bankruptcy on magic labeling of directed graphs

· purposes of theorems from graph thought and engaging counting arguments

· new learn difficulties and routines protecting various difficulties

· a completely up to date bibliography and index

This concise, self-contained exposition is exclusive in its specialise in the speculation of magic graphs/labelings. it might probably function a graduate or complex undergraduate textual content for classes in arithmetic or laptop technological know-how, and as reference for the researcher.

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**Additional resources for Magic Graphs**

**Sample text**

Cj = n − 61 write 48 n+5 n+5 + 10 + 8j, n − 1 − 24j − 20, + 4 + 8j, 3 3 n+5 n − 1 − 24j − 16, + 8 + 8j, n − 1 − 24j − 12, 3 n+5 n+5 + 6 + 8j, n − 1 − 24j − 8, − 1 + 8j, 3 3 n+5 n − 1 − 24j − 4, + 3 + 8j, n − 1 − 24j . 6 Wheels 47 Then the desired sequence is SS6 S9 . . S n−19 S n−10 T C n−61 . . C2 C1 D. ) 2. n ≡ 37 (mod 48), n ≥ 37. n−37 Write D = ( n+5 3 + 4), and for each j = 1, 2, . . , 48 define Cj = n+5 n+5 + 6 + 8j, n − 1 − 24j − 8, + 8j, 3 3 n+5 n − 1 − 24j − 4, + 4 + 8j, n − 1 − 24j, 3 n+5 n+5 + 2 + 8j, n − 1 − 24j + 4, − 5 + 8j, 3 3 n+5 n − 1 − 24j + 8, − 1 + 8j, n − 1 − 24j + 12 .

Avadayappan et al. [5] give the following simple construction for a super edgemagic labeling of a path. Say n = 2m or 2m+1. Label the vertices x1 , x2 , . . , x2m , preceded by x0 if n is odd. Vertices x1 , x3 , x5 , . . , x2n−1 receive labels 1, 2, 3, . . , n, while even vertices (x0 , x2 , x4 , . . , x2n when n is odd, x2 , x4 , x6 , . . , x2n in the even case) receive n+1, n+2, . . in order. When this labeling is completed in the obvious way, the magic sum is 12 (5n + 1) , the theoretical minimum.

14 1 Preliminaries λ(x)+λ(y) cannot equal λ(z)+λ(t). Thus, λ(x)−λ(z) = λ(t)−λ(y). Therefore the n2 differences between the labels of Kn are all different. If λ is any labeling of Kn , a ruler model of λ is constructed as follows. For each vertex of Kn , place a mark distance λ(x) from the start of the ruler. The ruler can be used to measure all distances corresponding to the distance between two marks. Ruler models are discussed, for example, in [14, 15]. The ruler models derived from edge-magic injections have the following special property.

### Magic Graphs by W. D. Wallis, Alison M. Marr

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