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+ | **Definition of a Model** | ||
It is convenient to define a model in terms of a [[formalisms:lagrangian_formalism|Lagrangian]]. However, there are models that cannot be described in terms of a Lagrangian((http://users.ox.ac.uk/~mert2255/papers/symmetries.pdf)). | It is convenient to define a model in terms of a [[formalisms:lagrangian_formalism|Lagrangian]]. However, there are models that cannot be described in terms of a Lagrangian((http://users.ox.ac.uk/~mert2255/papers/symmetries.pdf)). |