About

Hi! I’m Lasitha Jayasinghe, a mathematics student from Sri Lanka, also known online as cursed_tangent1434 .

I first found my way into mathematics through olympiads. In 2026, I represented Sri Lanka at the IMO and won the country’s first silver medal. These days I am also exploring undergraduate mathematics—particularly analysis, algebra and graph theory.

I teach olympiad students through OTIS and occasionally contribute to mathematical competitions as a grader and problem setter. I am especially interested in how students recognize ideas and develop problem-solving instincts.

This website is where I collect mathematics that I find interesting. Most posts are expository explorations of olympiad ideas, tricks and configurations; there are also occasional excursions into undergraduate mathematics and reflections on mathematical training. I also maintain a collection of handouts and mock contests.

If you are new here, you could begin with The Bevan Point, Prime Supports, or A pictorial proof of the Schröder–Bernstein theorem.

Outside mathematics, I play the piano, follow basketball, and enjoy Minecraft and trick-taking card games like 304.