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Classical Mechanics Is Lagrangian; It Is Not Hamiltonian; The Semantics of Physical Theory Is Not Semantical
classical mechanics Lagrangian mechanics Hamiltonian mechanics
2009/11/18
One can (for the most part) formulate a model of a classical system
in either the Lagrangian or the Hamiltonian framework. Though it is
often thought that those two formulations are equivalent in al...
In defence of naivete: The conceptual status of Lagrangian quantum field theory
Quantum field theory QFT
2008/4/14
I analyse the conceptual and mathematical foundations of
Lagrangian quantum field theory (that is, the "naive" quantum field theory used in mainstream physics, as opposed to algebraic quantum field ...
Historical, physical and geometrical relations between two different momenta, characterized here as Cartesian and Lagrangian, are explored. Cartesian momentum is determined by the mass tensor, and giv...
Between Laws and Models: Some Philosophical Morals of Lagrangian Mechanics
Classical mechanics Lagrangian mechanics
2008/4/10
I extract some philosophical morals from some aspects of Lagrangian mechanics. (A companion paper will present similar morals from Hamiltonian mechanics and Hamilton-Jacobi theory.) One main moral con...