Download A first course of mathematical analysis by David Alexander Brannan PDF

By David Alexander Brannan

Mathematical research (often referred to as complicated Calculus) is usually chanced on by means of scholars to be one in all their toughest classes in arithmetic. this article makes use of the so-called sequential method of continuity, differentiability and integration to assist you comprehend the subject.Topics which are commonly glossed over within the regular Calculus classes are given cautious research right here. for instance, what precisely is a 'continuous' functionality? and the way precisely can one supply a cautious definition of 'integral'? The latter query is usually one of many mysterious issues in a Calculus direction - and it really is really tough to provide a rigorous remedy of integration! The textual content has quite a few diagrams and worthy margin notes; and makes use of many graded examples and workouts, frequently with entire ideas, to lead scholars throughout the difficult issues. it's appropriate for self-study or use in parallel with a regular collage direction at the topic.

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We now show you how to do this. Prove that the least upper bound of [0, 2) is 2. Example 3 Solution We know that M ¼ 2 is an upper bound of [0, 2), because x 2; for all x 2 ½0; 2Þ: To show that 2 is the least upper bound, we must prove that each number M0 < 2 is not an upper bound of [0, 2). To do this, we must find an element x in [0, 2) which is greater than M0 . But, if M0 < 2, then there is a real number x such that 0 M

1: Numbers 24 Similarly, we define lower bounds. For example, the interval (0, 2) is bounded below by 0, since 0 for all x 2 ð0; 2Þ: x; However, 0 does not belong to (0, 2), and so 0 is not a minimum element of (0, 2). In fact, (0, 2) has no minimum element. Definitions A set E  R is bounded below if there is a real number, m say, called a lower bound of E, such that m x; for all x 2 E: If the lower bound m belongs to E, then m is called the minimum element of E, denoted by min E. Geometrically, the set E is bounded below by m if no point of E lies to the left of m on the real line.

3 1. Use the Triangle Inequality to prove that jaj 1 ) ja À 3j ! 2: 2. Prove that (a2 þ b2)(c2 þ d2) ! (ac þ ad)2, for any a, b, c, d 2 R. 3. Prove the inequality 3n ! 2n2 þ 1, for n ¼ 1, 2, . : 35 1: Numbers 36 (a) by using the Binomial Theorem, applied to (1 þ x)n with x ¼ 2; (b) by using the Principle of Mathematical Induction. 4. Use the Principle of Mathematical Induction to prove that, for n ¼ 1, 2, . . : (a) 12 þ 22 þ 32 þ Á Á Á þ n2 ¼ nðnþ1Þ6ð2nþ1Þ; qffiffiffiffiffiffiffiffi qffiffiffiffiffiffiffiffi 5=4 1Á3Á5Á ... Áð2nÀ1Þ 3=4 (b) 4nþ1 2Á4Á6Á ...

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