By J Martin Speight

ISBN-10: 1783267828

ISBN-13: 9781783267828

Actual research presents the basic underpinnings for calculus, arguably the main invaluable and influential mathematical concept ever invented. it's a middle topic in any arithmetic measure, and likewise one that many scholars locate not easy. *A Sequential creation to actual Analysis* provides a clean tackle genuine research via formulating the entire underlying suggestions by way of convergence of sequences. the result's a coherent, mathematically rigorous, yet conceptually easy improvement of the normal concept of differential and fundamental calculus perfect to undergraduate scholars studying actual research for the 1st time.

This e-book can be utilized because the foundation of an undergraduate genuine research direction, or used as extra examining fabric to provide another viewpoint inside of a traditional genuine research course.

Readership: Undergraduate arithmetic scholars taking a path in genuine research.

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**Additional resources for A Sequential Introduction to Real Analysis**

**Example text**

Since x is an upper bound on A, x ≥ an for all n ∈ Z+ . Further, as we just showed, every bn is an upper bound on A, so x ≤ bn for all n ∈ Z+ (else it isn’t the least upper bound on A). Hence x ∈ [an , bn ] = In for all n ∈ Z+ . It’s not hard to deduce from this lemma that R must be uncountable. In fact, we’ll show that [0, 1] is uncountable, from which the uncountability of R immediately follows. 33. [0, 1] is uncountable. Proof. Assume, to the contrary, that there is a surjective function f : Z+ → [0, 1].

7), so Q is countable. page 15 September 25, 2015 16 17:6 BC: P1032 B – A Sequential Introduction to Real Analysis A Sequential Introduction to Real Analysis We next prove that the set R is uncountable. It’s not hard to show that the set of all decimal expansions is uncountable. But, as far as we’re concerned, R is just a complete ordered ﬁeld and there is no obvious reason why every element of such a ﬁeld should be representable by a decimal expansion. To prove that R is uncountable without the crutch of decimal expansions, we need to introduce the idea of nested intervals.

6 Homework problems 1. Use the limit theorems in this chapter to prove that the following sequences converge. an = 15n2 − 6 ; 5n2 − 1 cn = n − n+1 n+2 n; bn = sin(2n + 1) ; n dn = 9n . (n + 8)! 2. Let an be the sequence deﬁned inductively by a1 = 2 and an+1 = (a) (b) (c) (d) 1 2 an + 2 . an Prove by induction that an ∈ [1, 2] for all n ∈ Z+ . Prove that a2n ≥ 2 for all n ∈ Z+ . Hence prove that the sequence is decreasing. We already know that (an ) is bounded below (by 1) so it follows, by the Monotone Convergence Theorem, that (an ) converges to some limit L.

### A Sequential Introduction to Real Analysis by J Martin Speight

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