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TimeRip496

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*fixing*a gauge (thus

*breaking*or

*spending*the gauge symmetry), the model becomes something easier to analyse mathematically, such as a system of partial differential equations (in classical gauge theories) or a perturbative quantum field theory (in quantum gauge theories), though the tractability of the resulting problem can be heavily dependent on the choice of gauge that one fixed.

https://terrytao.wordpress.com/2008/09/27/what-is-a-gauge/

What do you mean by this? As in why does gauge fixing made the model easier to analyse? Isnt gauge fixing something like choosing a coordinate?