What exactly do you call Real Analysis?

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Discussion Overview

The discussion centers on the definition and scope of real analysis as understood in the United States, particularly in the context of undergraduate and graduate education. Participants explore whether real analysis is primarily focused on $\delta$-$\epsilon$ approaches to calculus or if it encompasses measure theory and integration, including the Lebesgue integral.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants suggest that undergraduate real analysis in the US involves $\delta$-$\epsilon$ proofs related to calculus theorems and sequences of numbers and functions, with Rudin's "Principles of Mathematical Analysis" being a typical textbook.
  • Others argue that graduate-level real analysis focuses on measure and integration, including Lebesgue integrals, with Royden's "Real Analysis" often cited as a standard reference.
  • A participant questions whether there is a separate course for calculus and undergraduate real analysis.
  • Another participant confirms that there is typically a sequence of three semesters of calculus followed by an introduction to differential equations, with real analysis usually being a senior-level course.
  • Some colleges may offer a course termed "advanced calculus," which can vary in content from real analysis to applied multivariable calculus.

Areas of Agreement / Disagreement

Participants generally agree on the structure of mathematics courses in the US, including the separation of calculus and real analysis. However, there are differing views on the exact content and focus of real analysis at both the undergraduate and graduate levels.

Contextual Notes

The discussion reflects varying interpretations of real analysis, with some ambiguity regarding the definitions and scope of topics covered in different educational contexts.

ModusPonens
Hello

I'm curious to know what exactly do americans call real analysis. Is it a $\delta$ $\epsilon$ approach to calculus? Or is it the theory of measure and integration, consisting mostly of the Lebesgue integral?

EDIT: I didn't want to disrupt the topic on the motivation letter for graduate school.
 
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ModusPonens said:
Hello

I'm curious to know what exactly do americans call real analysis. Is it a $\delta$ $\epsilon$ approach to calculus? Or is it the theory of measure and integration, consisting mostly of the Lebesgue integral?

EDIT: I didn't want to disrupt the topic on the motivation letter for graduate school.

The answer is "yes". Real analysis at the undergraduate level in the US is typically $\delta-\epsilon$ proofs of the big theorems in calculus, and plenty of sequences, both of numbers and functions. The stereotypical book is Rudin's Principles of Mathematical Analysis. Graduate-level real analysis is measure and integration, including Lebesgue and generalized measure integrals (the proofs are all the same, so a Caratheodory approach, e.g., does them more or less simultaneously for more generality). Real analysis does not typically include significant functional analysis, although functional analysis does depend on real analysis. The stereotypical book here is Royden's Real Analysis.
 
But do you have a separate course for calculus and undergrad real analysis?
 
Yes, we do. We usually have three semesters of Calculus (roughly differential, integral, and multivariable), followed by an introduction to differential equations. That finishes up the sophomore year, although many colleges also offer linear algebra and discrete mathematics in the sophomore year as well.

Some colleges offer what they call advanced calculus in the junior year, which can be anything from full-blown real analysis to heavily applied multivariable calculus. Real analysis, the full $\delta-\epsilon$ proof course, is usually a senior-level course.
 

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