Source: cirosantilli/generalized-coordinate

= Generalized coordinate
{wiki}

The variables of the <Lagrangian>, e.g. the angles of a <double pendulum>. From that example it is clear that these variables don't need to be simple things like <cartesian coordinates> or <polar coordinates> (although these tend to be the overwhelming majority of simple case encountered): any way to describe the system is perfectly valid.

In <quantum field theory>, those variables are actually fields.

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