What property of lagrangian is used here?

Click For Summary
SUMMARY

The discussion focuses on the invariance property of Lagrangian equations under coordinate transformations, specifically addressing the equation \(\frac{\partial q^{i}}{\partial \dot{Q}^{j}} = 0\). Participants seek clarification on the derivation process from one term to another in the context of Lagrangian mechanics. The reference to a Nordic language indicates a potential language barrier in understanding the mathematical notation. Overall, the conversation emphasizes the importance of grasping the transformation properties in Lagrangian dynamics.

PREREQUISITES
  • Understanding of Lagrangian mechanics
  • Familiarity with coordinate transformations
  • Basic knowledge of partial derivatives
  • Ability to interpret mathematical notation in physics
NEXT STEPS
  • Study the invariance of Lagrangian equations under coordinate transformations
  • Explore examples of coordinate transformations in classical mechanics
  • Learn about the implications of \(\frac{\partial q^{i}}{\partial \dot{Q}^{j}} = 0\) in Lagrangian dynamics
  • Review mathematical notation used in physics, particularly in Lagrangian mechanics
USEFUL FOR

Students of physics, researchers in classical mechanics, and anyone interested in the mathematical foundations of Lagrangian dynamics.

aaaa202
Messages
1,144
Reaction score
2
Hi, the attached picture shows a derivation of what I can only assume to be the property that the lagrange equations are invariant under a transformation of the coordinates.
But I have some trouble understanding how you go from the term pointed out the rear of the arrow to the point pointed out by the front of the arrow. Can anyone explain?
 

Attachments

  • lagrangian.png
    lagrangian.png
    21.3 KB · Views: 528
Physics news on Phys.org
It's really easy

[tex]\frac{\partial q^{i}}{\partial \dot{Q}^{j}} = 0[/tex]

then he used the equality written on the first line just before the text written (apparently) in some Nordic language.
 

Similar threads

  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
25
Views
4K
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 30 ·
2
Replies
30
Views
8K
  • · Replies 6 ·
Replies
6
Views
4K