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math.AG2021
Toroidal compactifications and Borel--Serre compactifications
Kazuya Kato, Chikara Nakayama, Sampei Usui
We discuss connections of toroidal compactifications and Borel--Serre compactifications in view of the fundamental diagram of extended period domains. We give a complement to a wor…
math.AG2021
Classifying spaces of degenerating mixed Hodge structures, V: Extended period domains and algebraic groups
Kazuya Kato, Chikara Nakayama, Sampei Usui
For a linear algebraic group over , we consider the period domains classifying -mixed Hodge structures, and construct the extended period domains $D_{\mathrm{BS}}…