In this workshop we will discuss algebraic structures related to numerical integrators for ODEs. The main topics are B-series expansions, pre-Lie algebras, post-Lie algebras, operads, geometric integration.

Here is a list of the literature that Kurusch mentioned:

• On post-Lie algebras, Lie-Butcher series and moving frames by Hans Munthe-Kaas and Alexander Lundervold
• On algebraic structures of numerical integration on vector spaces and manifolds by Alexander Lundervold and Hans Z. Munthe-Kaas
• A short survey on pre-Lie algebras by Dominique Manchon
• Left-symmetric algebras, or pre-Lie algebras in geometry and physics by Dietrich Burde
• Energy-preserving integrators and the structure of B-series by Elena Celledoni, Robert I McLachlan, Brynjulf Owren and GRW Quispel
• Two interacting Hopf algebras of trees by Damien Calaque, Kurusch Ebrahimi-Fard and Dominique Manchon

• Opening of the workshop room 1329 with coffee/tea at 9:00 am.
• Dominique will talk about pre-Lie algebras room 734
• Discussion
• Lunch at the university restaurant at 12:30
• Elena will talk about geometric B-series room 734
• Discussion and work in groups.

• We meet for coffee/tea at 9:00 am.
• Hans will talk about post-Lie algebras room 734
• Discussion
• Lunch
• Alexander will talk about post-Lie algebras room 734

• We meet for coffee/tea at 9:00 am.
• Jon Eivind Vatne will talk about operads
• Discussion
• Lunch
• Kurush will talk about Magnus expansion and pre-Lie algebras room 734
• Dinner at To rom og kjøkken at 7:00 pm. To find it try Restaurant To Rom og Kjøkken, Carl Johans gate, Trondheim, Norway on Google maps

• We meet for coffee/tea at 9:00 am.
• Talks or discussions

• We meet for coffee/tea at 9:00 am.
• Work in groups
• Lunch at the university restaurant at 12:30
• Closing remarks