Van Kampen's Theorem (Hatcher 1.2)

Round-14 hunt: picked; source: named-course long-video search (r13 queries, single-hit channels, second look); channel screens (sellers/exam/re-upload/devotional/vendor/events), provenance check, vendor/seller/devotional recheck and quality tier C + tier-C depth check passed; strict per-title check + final strict pass; oEmbed verified.

A 129-minute video from Matthew Kowalski: “Van Kampen's Theorem (Hatcher 1.2)”.

Video by Matthew Kowalski, played through YouTube's embedded player.