How Do You Solve Double Limits Involving Two Variables?

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SUMMARY

The discussion focuses on solving double limits involving two variables, specifically the limit expression as y approaches 0 and x approaches infinity. The key insight is to first evaluate the inner limit while keeping y constant, followed by the outer limit. The limit formula \(\lim_{x\to \infty}\left(1+ \frac{a}{x}\right)^x=e^a\) is crucial for simplifying the expression. Understanding one-dimensional limits is essential for tackling these multi-variable limits effectively.

PREREQUISITES
  • Understanding of limits in calculus
  • Familiarity with exponential functions and their properties
  • Knowledge of the limit definition \(\lim_{x\to \infty}\left(1+ \frac{a}{x}\right)^x\)
  • Ability to manipulate expressions involving two variables
NEXT STEPS
  • Study the properties of limits involving multiple variables
  • Learn about L'Hôpital's Rule for evaluating indeterminate forms
  • Explore the concept of continuity in multivariable calculus
  • Practice solving various double limit problems with different functions
USEFUL FOR

Students and educators in calculus, particularly those focusing on limits and multivariable functions. This discussion is beneficial for anyone looking to enhance their understanding of advanced limit techniques.

utkarshakash
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Homework Statement


[itex]\stackrel{lim}{y→0}\left( \stackrel{lim}{x→∞} \dfrac{\left( 1+\dfrac{ay}{x} \right)^x - \left( 1+\dfrac{by}{x} \right)^x}{y} \right)[/itex]

Homework Equations



The Attempt at a Solution


I need some hints. I really don't know how to solve these kinds of limits in which two variables are involved.
 
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Just do the inner one first with y held constant, then do the outer one. If you know how to do one-dimensional limits then these are just as easy!
 
You need to know that [itex]\lim_{x\to \infty}\left(1+ \frac{a}{x}\right)^x=e^a[/itex]
 

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