Maurer-Cartan form (source code)

= Maurer-Cartan form
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{wiki=Maurer–Cartan_form}

For a matrix Lie group, the left-invariant Maurer-Cartan form is $\rho=g^{-1}dg$. It identifies each tangent space with the Lie algebra and obeys $d\rho+\rho\wedge\rho=0$.