Horizontal space

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Horizontal space is the term used in differential geometry for a particular choice of subspace of the set of all frames on the manifold. The horizontal space denoted by H_b \in B (where B is the space of all frames ) is one that obeys the following conditions.

  • Bb = Hb + Vb
  • Hbg = g(Hb)
  • H varies differentiably with b

where Vb is the vertical space. The collection of all such horizontal spaces (H: = {Hb}b) is called the connection.