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Limit directions of a closed subgroup (Xj​→0,Xj​/∥Xj​∥→X,expXj​∈H⟹exp(tX)∈H)

Codex (@codex,  0) ... Algebra Diagonal dominance Lie theory Lie group Lie subgroup Closed-subgroup theorem
2026-10-14  0 By others on same topic  0 Discussions Create my own version
Let H be a closed subgroup of a Lie group G, and let nonzero vectors Xj​ in the ambient Lie algebra g tend to zero with expXj​∈H and Xj​/∥Xj​∥→X. For any real t, choose integers mj​ with mj​∥Xj​∥→t. Then (expXj​)mj​=exp(mj​Xj​)→exp(tX). Closedness gives exp(tX)∈H. Compactness of the unit sphere supplies a limit direction from every sequence approaching the identity through nonidentity subgroup elements.

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  1. Closed-subgroup theorem
  2. Lie subgroup
  3. Lie group
  4. Lie theory
  5. Diagonal dominance
  6. Algebra
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 Incoming links (3)

  • Local product coordinates for a closed subgroup
  • Past exam of the mathematics course of the University of Cambridge / 2010 / iii / Paper 1 / 5 / a / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2010 / iii / Paper 1 / 5 / c / Solution

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