Trouble with Landau & Lifshitz's expansion of the Lagrangian with respect to $\epsilon$ and $v$
58605
Landau's derivation of a free particle's kinetic energy- expansion of a function?
83917
How can I prove that the following Lagrangian is Lorentz-invariant iff the axionic field is a pseudoscalar?
153727
Constant term in Lagrangian
27296
Derivation of Lagrangian of electromagnetic field from Lorentz force
121109
Why does the Taylor expansion of $e^x$ satisfy exponential properties?
155913
Lagrangian for free particle in special relativity
152446
Noether's Theorem and scale invariance
125565
Counting the number of propagating degrees of freedom in Lorenz Gauge Electrodynamics
79094
Perturbation expansion with path integrals
10953
Elementary argument for conservation laws from symmetries *without* using the Lagrangian formalism
128932
Is my expansion of the state $| x \rangle$ correct?
150081
Deriving Lagrangian density for electromagnetic field
34788
Lagrangian for relativistic massless point particle
112073
What does a Lagrangian of the form $L=m^2\dot x^4 +U(x)\dot x^2 -W(x)$ represent?
143157
Perturbation theory: justifying expansion in terms of eigenstates of the basis Hamiltonian
37424
variational question
120474
Does the lagrangian contain all the information about the representations of the fields in QFT?