Jeffery Mensah
about
Hello! I'm Jeffery. This site collects my musings and writings on topics I am generally interested in, such as mathematics, music, or software development.
recent posts
Counting symmetric scales in equal-temperament
In this post, we give two puzzles related to a concept in music theory referred to as scale symmetry. Roughly speaking, a symmetric scale is a musical scale which does not give a strong impression...
Colimits of presheaves and the density theorem
The goal of this short note is to show how to compute the limit or colimit of a diagram of presheaves, and prove that every presheaf can be written as the colimit of representable...
Interpreting adjoint functors
The notion of an adjunction between categories is a fundamental idea in category theory whose utility is so great that it appears in virtually every field of mathematics. Roughly speaking, an adjunction is...