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Dehann Fourie edited this page Oct 23, 2024 · 14 revisions

Welcome to the ApproxManifoldProducts.jl wiki!

Working Assumptions

  • Manifolds.exp_lie != Manifolds.exp even at identity,
  • Trivialized Jl == Jr [VanGoor Mahony 2024]
  • if the metric is biinvariant, the Cartan-Schouten-0 connection == Levi-Civita
    • e.g. for M=SO(n), exp(M,) = exp_lie(M,)

To Confirm:

  • for Lie Groups, is a push forward (using Jacobian of function Manifolds.translate) equivalent to the parallel transport. And, how does this relate to left-invariance

  • Manifolds.translate_diff vs Chirikjian Vol.2 ~p30 Jacobian (see about basis and generating Jacobian). See also Forney Jacobian and push-forward vs basis. Differential of group translate is vector transport. 8-o https://math.stackexchange.com/questions/2066207/how-can-one-define-parallel-transport-on-lie-groups

    • Differential vs Jacobian only one has direction
    • if you transport (maybe push forward) two vectors from TpM to TqM, and they no longer match up, then there is torsion along the path/geodesic? Does this relate to commutability
  • Compare manifold approach vs vector field approach.

  • Left invariant vector transport is invariant (i.e. identity)

  • is dLa (a map), i.e. the differential/derivative, is this also the Jacobian

  • when doing parallel transport do you need the following:

    • Riemannian you need a metric to show the curvature?
    • for Lie Group you need an affine connection (i.e. covariant derivative, exp_lie, group operation / one parameter subgroup to get geodesic curve along which to transport)
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