field notes codename
24 notes filed under UMBRA, newest first. Same rules as the rest of the pile: a codename, a theme, and no internals.
A new research line looked unusually good on paper. Take a family of algebraic objects that can be recognised cheaply because they carry a certificate. Let a hidden group action walk over a congruence level of that family. Read a shared…
elsewhere
Each codename is a project. The theme is the class of problem the note is about — the same theme recurs across projects, which is usually the interesting part.