# Exposition

Occasionally when people teach me things, I write them down. This is done neither as frequently, nor as accurately as I'd like, but might prove useful every now and then to someone nonetheless.

**Toroidal and Log Structures**. A very quick and dirty introduction to thinking about toroidal embeddings and log structures.**The Tangent-Obstruction Complex**. My notes from trying to learn about obstruction theory in the context of GW invariants.**2875 Lines on the Quintic Threefold**. A sketch of this classical result from enumerative geometry.**Grothendieck Ring of Varieties**. My notes from a lecture by Ravi Vakil at WAGS.**(Tropical) Hilbert's Theorem 90**.