Quantum redactiones paginae "Aequationes Lagrangi" differant

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===Functio Lagrangiana contextu relativistica speciali===
Methodus Lagrangiana nos sinit ad [[Relativitas specialis|contextum relativisticum]] discriptiones mechanicas facilius generalizare. Exempli gratia particulam [[Onus electricum|onerus electricum]] habentem consideremus, quae in [[Campus physicus|campo electromagnetico]] gyrat, in contextu relatvitistica speciali. Functio Lagrangiana huius particulae est:
 
:::<math> L = - m c^2 \sqrt {1 - \frac{v^2}{c^2}} - q \phi [\vec{x},t] + q \dot{\vec{x}} \cdot \vec{A} [\vec{x},t]</math>
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:::<math>\vec{E}[\vec{x},t] = - \nabla\phi [\vec{x},t] - \partial_t{\vec{A}} [\vec{x},t] </math>
:::<math>\vec{B}[\vec{x},t] = \nabla \times \vec{A} [\vec{x},t] </math>
sunt campus electricus et campus magneticus quos e [[Aequationes Maxwellianae|aequationibus Maxwellinis]] obtinemus.
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===Functio Lagrangiana contextu relativistica generali===