Homological algebra | Cohomology theories | Lie algebras

Cartan pair

In the mathematical fields of Lie theory and algebraic topology, the notion of Cartan pair is a technical condition on the relationship between a reductive Lie algebra and a subalgebra reductive in . A reductive pair is said to be Cartan if the relative Lie algebra cohomology is isomorphic to the tensor product of the characteristic subalgebra and an exterior subalgebra of , where * , the Samelson subspace, are those primitive elements in the kernel of the composition , * is the primitive subspace of , * is the transgression, * and the map of symmetric algebras is induced by the restriction map of dual vector spaces . On the level of Lie groups, if G is a compact, connected Lie group and K a closed connected subgroup, there are natural fiber bundles , where is the homotopy quotient, here homotopy equivalent to the regular quotient, and . Then the characteristic algebra is the image of , the transgression from the primitive subspace P of is that arising from the edge maps in the Serre spectral sequence of the universal bundle , and the subspace of is the kernel of . (Wikipedia).

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Related pages

Cartan decomposition | Lie algebra cohomology | Transgression map | Reductive Lie algebra | Mathematics | Universal bundle | Serre spectral sequence | Symmetric algebra | Lie theory | Algebraic topology