What is the transformation rule for vector-covector derivatives?

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SUMMARY

The transformation rule for vector-covector derivatives is established through the application of the chain rule and the properties of partial derivatives. Specifically, when differentiating a covector \( A_a \) with respect to coordinates \( x^b \), the terms involving mixed partial derivatives, such as \( \frac{\partial^2 f}{\partial x \partial y} - \frac{\partial^2 f}{\partial y \partial x} \), vanish, confirming the correct transformation behavior. The key to resolving the issue lies in correctly applying the transformation rules for vectors and covectors and ensuring differentiation is performed in the appropriate coordinate system.

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  • Understanding of vector and covector notation in differential geometry.
  • Familiarity with the chain rule in multivariable calculus.
  • Knowledge of partial derivatives and their transformation properties.
  • Basic concepts of coordinate transformations in smooth manifolds.
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Homework Statement


We have a vector X^a (n.b ^ indicates superscript) and covector Aa. We need to show that
X^b (d(Aa)/d(x^b) - d(Ab)/d(x^a))

transforms correctly under an artbitrary smooth change of coords. N.b the derivatives are partial.

By using the transformation rules for the vector and covector respectively I get four terms, two of which give us the required transformation rule. I can't get the other two to disappear. I'd appreciate any hints.
 
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When I do it I find the other two terms vanish because they contain a term like \frac{ \partial^2 f}{\partial x \partial y}-\frac{\partial^2 f}{\partial y \partial x}.
 
Last edited:
I managed to get this. I was differentiating with respect to the wrong coordinate system, which messed up the calculation. I then tried using the chain rule and differentiating with respect to the other coord system and it all fell out.
 

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