Talk 4: A geometric model for the stack of vector bundles (Xiaowen Dong) – Easy

Discuss with the previous speaker about possibly different allocations of material between
this and the previous talk. Prove [AHI25, Corollary 4.11]. Prove [AHI25, Corollary 4.13
and Proposition 4.14]. In the second half of the talk, explain the geometric model for the
stack of vector bundles, i.e. prove [AHI25, Proposition 5.1, Lemma 5.2 and Theorem 5.3].