By Ian Anderson

ISBN-10: 1852332360

ISBN-13: 9781852332365

Discrete arithmetic has now tested its position in so much undergraduate arithmetic classes. This textbook offers a concise, readable and obtainable creation to a few issues during this quarter, resembling enumeration, graph conception, Latin squares and designs. it's aimed toward second-year undergraduate arithmetic scholars, and offers them with some of the uncomplicated options, rules and effects. It comprises many labored examples, and every bankruptcy ends with a good number of workouts, with tricks or options supplied for many of them. in addition to together with ordinary subject matters reminiscent of binomial coefficients, recurrence, the inclusion-exclusion precept, timber, Hamiltonian and Eulerian graphs, Latin squares and finite projective planes, the textual content additionally comprises fabric at the ménage challenge, magic squares, Catalan and Stirling numbers, and event schedules.

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**Extra resources for A First Course in Discrete Mathematics**

**Sample text**

Th e number of good routes from A (O ,O) to B (n , n) which do not cross th e dia gonal A B is t he to tal number of up-righ t routes from A t o B minu s t he numb er of routes which do cross AB. Let's call routes which cross AB bad rou te s. 7 Consi der any bad route. 7) th en we get an up-ri ght route from H(-I, 1) to B(n ,n). Conv ersely, any up-r ight route from H to B must cross GF somewhere, and ari ses from precisely one bad route from A to B . So t he numb er of bad routes is ju st t he number of to (n, n ), which is up-ri ght ro utes from (- 1, 1) ( n 1n+ 1 1) + + n- = ( 2n ) .

If is denot ed by K m,n or by K n,m . 6 is K 1 ,4 . Clear ly, K m,n has m + n vert ices an d mn edges; m of t he vert ices have degree n , and n of the vertices have degr ee m . T he complete grap hs K n and th e complete bip ar t ite graphs Km,n play important roles in graph th eory, par ti cularly in the st udy of pla narity to which we now t urn. 6Planarity A gra ph is planar if it can be dra wn in t he plan e with no edges crossing. T he concept of plan arity has alr ead y appear ed in th e utilities pro blem , which ca n be restated as : is K 3 ,3 plan ar ?

The vertices ar e represented by points, and the edges by lines (not necessarily straight) joining pairs of points. If an edge e joins vertices x and y then x and y are adjacent and e is incident with both x and y. Any edge joining a vertex x to itself is called a loop. Note that we say E is a collection of pairs, not a set of pairs. This is to allow repeated edges . If two or more edges join the same two vertices, they are called multiple edges. 1(b) has two pairs of multiple edges . e. it has no loops or multiple edges .