Is there a constraint on the Lagrangian that prevents it from having multiple stationary points?
44650
Several stationary points of the action functional
33271
Two bodies of finite size treated as two point masses in Newtonian gravity
151285
Existence of a local geodesic frame
155913
Lagrangian for free particle in special relativity
153656
What Lagrangian counterterms might be needed in a $\phi^ 6$ theory in 3D?
61142
Is there any physics that cannot be expressed in terms of Lagrange equations?
43492
When motion begins, do objects go through an infinite number of position derivatives?
96880
How to obtain Hamiltonian formalism and phase space for Lagrangian with second-derivatives?
112723
The problem of self-force on point charges
123235
A smooth vector field on $S^2$ vanishing at a single point
51601
Double counting potentials in $N$-Body Problem?
23219
The plane minus $n$ points deformation retracts onto...
30992
How do you determine the Lagrangian?
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
103282
How to constrain rigid bodies to an axis?
66524
The Impossibility ( or Possibility) of Solving $N$-Body Problem
23518
How are the Lagrange points determined?