An Introduction to Sequences in Real Analysis @JoelRosenfeld
An Introduction to Sequences in Real Analysis  @JoelRosenfeld
Uploaded April 2023 | Updated September 2026, 1 week ago
Here we dissect a theorem statement about convergent sequences from Rudin's Principles of Mathematical Analysis (a.k.a. Baby Rudin). There is a lot to unpack here, including some allusions to Topology.

//Books

A great companion text to Rudin is Maxwell Rosenlicht's Introduction to Analysis. The explanations are a lot clearer and the book is under $20.
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Walter Rudin - Principles of Mathematical Analysis 3rd Edition - amzn.to/3MDHUis
Gerald Folland - Real Analysis: Modern Techniques and Their Applications - amzn.to/3JmK6Np

R. Shankar - Principles of Quantum Mechanics - amzn.to/40825xj
Tom Apostol - Mathematical Analysis 2nd Edition - amzn.to/3mwxFlC

//Reference for Cantor’s Work
ias.ac.in/article/fulltext/reso/019/11/0977-0999

//Exercises
- Show that the elements of the Cantor set can be written in base-3 as 0.a_1 a_2 a_3 … where each a_i is either 0 or 2.

//Watch Next
The Real Analysis Survival Guide youtu.be/v5rD0B-zfXw
Mastering the Art of Reading a Proof: By Example youtu.be/WPWf_s6Q1QQ
Introduction to Control Theory youtu.be/0v4WFmOm764

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0:00 Introduction
0:40 Anticipating Topology
1:48 Proof of Part A
3:53 Can a sequence converge to more than one point?
5:17 Proof of Part B
8:21 Using a Theorem Backwards
8:47 Functional Analysis Example
10:28 What about a PROOF?
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An Introduction to Sequences in Real Analysis

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