By Howard Anton and Bernard Kolman (Auth.)

Lifelike and appropriate purposes from quite a few disciplines aid encourage enterprise and social technological know-how scholars taking a finite arithmetic path. a versatile business enterprise permits teachers to tailor the publication to their path

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Upon reaching the intersection he turns either left or right and at the next inter section he turns either left or right again. The rat then proceeds to the reward section. 4 COUNTING ELEMENTS IN SETS / 31 (a) Show that the various paths that the rat can take can be represented as the elements of the Cartesian product E X T X T, where E = {a, ò, c}, T = {ly r), I = left, r = right. (b) List all possible paths. 4 COUNTING ELEMENTS IN SETS Suppose we know the number of elements in a set A and the number of elements in a set B.

Thus, for (a, b) and (c, d) to be equal ordered pairs, we must have a = c and b = d. We are now in a position to define the last set operation we shall need. If A and B are two sets, the set of all ordered pairs (a, 6), where a £ A and b £ By is called the Cartesian] pmdttetvl product of A mutt and B; B;ititisis denoted by the symbol AXB. Ά X ß* t René Descartes (1596-1650)—Descartes was the son of a government official. He graduated from the University of Poitiers with a law degree at age 20, after which he went to Paris, where he lived a dissipâtive life as a man of fashion.

B) With each negative number — r associate the point that is a distance of r units from the origin in the negative direction. (c) Finally, associate the origin with the real number 0. 1 In Figure 2. lb we have marked on the real line the points that are associated with some of the integers. The real number corresponding to a point on the real line is called the coordinate of the point. 25, and π. It is evident from the way in which real numbers and points on the real line are related that each real number corresponds to a single point and each point corresponds to a single real number.