Ordinary and covaraint derivative

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Discussion Overview

The discussion centers on the concept of covariant derivative, contrasting it with the ordinary derivative, particularly in the context of its dependence on coordinate systems and its application in Riemannian geometry. Participants explore the implications of covariant derivatives in relation to the metric tensor and its properties.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the meaning of covariant derivative, noting that while an ordinary derivative being zero indicates independence from a variable, the implications for covariant derivatives are less clear.
  • Another participant explains that the classical derivative is coordinate-dependent, whereas the covariant derivative is designed to be independent of the coordinate system, incorporating adjustments via Christoffel Symbols.
  • A third participant provides a link to a Wikipedia article for further reading on covariant derivatives.
  • Another participant references a related discussion on covariant and contravariant tensors, suggesting it may be relevant to the topic at hand.

Areas of Agreement / Disagreement

Participants express differing levels of understanding and perspectives on the covariant derivative, indicating that the discussion remains unresolved with multiple viewpoints presented.

Contextual Notes

Some assumptions about the definitions and implications of covariant derivatives may not be fully articulated, and the relationship between covariant and ordinary derivatives is still being explored.

world line
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Hello
what is the meaning of covaraint derivative ?
where the ordinary derivative of a function whit respect to a variable is zero, it means that function doesn't depend on that variable.but what about covaraint derivative ?
for example the metric tensor may depends on coordinate but its covaraint derivative is zero.
 
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The classical (directional) derivative is dependent on your choice of coordinates. The covariant derivative is not; is it covariant in the sense that it is defined in such a way as to be independent of its description in a particular coordinate system. That is why it is written as a directional derivative plus a term that compensates for any changes in coordinates, expressed through the Christoffel Symbols. It is basically a generalization of the classical derivative into Riemann geometry.
 

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