 Notes from a talk that I gave at a reading seminar in Münster on Functor Calculus. (February 2015)
 A brief note on gluing topological spaces via attaching maps that are homotopic. (February 2017)
 Some informal notes containing a brief description of Ruth Lawrence's construction of representations of surface braid groups. (March 2017)
 A pair of short notes about the derived series of the group of unitriangular matrices over the integers and of the group of invertible upper triangular matrices over the integers, which arose from an algebra course that I was an assistant for. (November 2017)
 A brief note on Assertion 6 in Milnor's book on the hcobordism theorem, which arose during a seminar that I organised in the summer semester 2018 in Bonn. (June 2018)

 