Here you can find the entire script of the lecture notes on Nonlinear Functional Analysis of Kai Cieliebak.
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Here you can read the lecture notes on Symplectic Geometry of Kai Cieliebak.
This short silent film explains the Intermediate Value Theorem.
It was made by the AMU University of Augsburg. The actors are Airi Takeuchi and Kai Cieliebak.