Continuity of the derivative Df

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SUMMARY

The discussion centers on the definition of a function f: R^n → R^n being of class C^1, which indicates that the derivative Df exists and is continuous. The participants clarify that while all linear maps from R^n to R^m are indeed continuous, the continuity of Df refers to the map that sends x in R^n to the linear map Df(x) in the space of linear maps. This interpretation is crucial for understanding the implications of C^1 functions in calculus and analysis.

PREREQUISITES
  • Understanding of multivariable calculus and derivatives
  • Familiarity with the concept of continuity in mathematical functions
  • Knowledge of linear algebra, particularly linear maps
  • Basic comprehension of function classes, specifically C^1 functions
NEXT STEPS
  • Study the properties of C^1 functions in real analysis
  • Learn about the implications of continuity of derivatives in optimization problems
  • Explore the relationship between linear maps and continuity in linear algebra
  • Investigate the concept of Fréchet derivatives in functional analysis
USEFUL FOR

Students and professionals in mathematics, particularly those studying calculus, real analysis, and linear algebra, will benefit from this discussion.

quasar987
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Homework Statement


I'm reading this at the moment: "Let f:R^n-->R^n be of class C^1 (that is, assume Df exists and is continuous)"

What does it mean?? If it means that for all x in R^n, the linear map Df(x):R^n-->R^n is continuous, then it's a triviality since all linear maps from R^n to R^m are continuous. So I am skeptical that this is what it means!

What other option is there? That map that send x in R^n to the point Df(x) in the space of linear map is a continuous map? I highly doubt that!

So what does it mean??
 
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C^1 usually means continuous partials.
 
Thanks for the tip!
 

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