Evaluate limit relation between variables in Mathematica

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SUMMARY

This discussion focuses on evaluating limits in Mathematica, specifically the limit of the expression "X + Y" as Y approaches zero relative to X (Y/X -> 0). The user demonstrates the use of substitution and series expansion to achieve this, providing the example of substituting Y with a small value in relation to X. The final output shows that as Y approaches zero, the expression simplifies to X. The method involves using the Series function to expand the expression around the limit.

PREREQUISITES
  • Familiarity with Mathematica syntax and functions
  • Understanding of limits and asymptotic behavior in calculus
  • Knowledge of series expansion techniques
  • Experience with variable substitution in mathematical expressions
NEXT STEPS
  • Explore the use of the Series function in Mathematica for different types of expansions
  • Learn about variable substitution techniques in Mathematica
  • Investigate the behavior of limits involving multiple variables in Mathematica
  • Study asymptotic analysis and its applications in mathematical modeling
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Mathematicians, students, and researchers working with Mathematica who need to evaluate limits involving multiple variables and asymptotic expressions.

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Hello.
How do I evaluate, in Mathematica, limits like this:
"X+Y" when X is much bigger than Y, i.e., when Y/X->0. The unswer should be X+Y->X.

Regards.
 
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I've never seen Mathematica take limits with respect to an expression. All the examples I've seen take limits with respect to a variable.

Perhaps you could see how to use this:

In[1]:= x+y/.y->10.^-100x

Out[1]= 1. x
 
I always just use a scale variable and expand.

let z = x/y:

F[x_, y_] := x + y
Normal[Series[F[x, z x], {z, 0, 0}]]
 

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