Lean Together 2025: Oliver Nash, Root systems and root data in Mathlib

Whole-channel inclusion: leanprover community is an honest teaching channel (title sample + 3 transcripts read: All three transcripts show expert technical conference talks with structured explanations of formal methods and mathematics, consistent with the channel's teaching focus.); this title passed a strict title check (sonnet) after a labelling pass.

A 30-minute video from leanprover community: “Lean Together 2025: Oliver Nash, Root systems and root data in Mathlib”.

Video by leanprover community, played through YouTube's embedded player.