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INSTITUTO POLITÉCNICO NACIONAL - Instituto Avanzado de ...

INSTITUTO POLITÉCNICO NACIONAL - Instituto Avanzado de ...

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3.2. ÁLGEBRAS DE LIE 70Demostración. Tenemosd (X ; X ) = X ( (X )) X ( (X )) ([X ; X ])= X ( ) X ( ) (c X )= c ; (3.25)y <strong>de</strong>12 c ^ (X ; X ) = c : (3.26)comoPo<strong>de</strong>mos <strong>de</strong>…nir una 1-forma ! g 2 T g G ! T e G, evaluada en el álgebra <strong>de</strong> Lie! g : T g G ! T e GX ! ! g (X) = dL g 1j g X (3.27)don<strong>de</strong> ! g es la 1-forma canónica o forma <strong>de</strong> Maurer-Cartan en G.Teorema 3.2.1. La forma <strong>de</strong> Maurer- Cartan se pue<strong>de</strong> expandir como! = V ; (3.28)con fV g base <strong>de</strong> T e G y f g base <strong>de</strong> T e G:[25]

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