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where '''g''' is the Minkowski metric, '''F''' is the [[curvature form]]
:<math>d\bold{A}+\bold{A}\wedge\bold{A}</math>
(no ''i''s or ''g''s!) where the second term is a formal shorthand for pretending the Lie bracket is a commutator, ''D'' is the covariant derivative
:Dσ = dσ − '''A'''[σ]
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