Comparing the Methods of Alternating and Simultaneous Projections for Two Subspaces

Comparing the Methods of Alternating and Simultaneous Projections for Two Subspaces

Comparing the Methods of Alternating and Simultaneous Projections for Two Subspaces

Sunday, June 25, 2023
  • Lecturer: Rafal Zalas (Technion)
  • Organizer: Simeon Reich
  • Location: Room 814, Amado Mathematics Building
Abstract:
Abstract: We study the well-known methods of alternating and simultaneous projections when applied to two nonorthogonal linear subspaces of a real Euclidean space. Assuming that both methods have a common starting point chosen from either one of the subspaces, we show that the method of alternating projections converges significantly faster than the method of simultaneous projections. On the other hand, we provide examples of subspaces and starting points, where the method of simultaneous projections outperforms the method of alternating projections. This is joint work with Simeon Reich  
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