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math.RT2026
Regularity of Totally Nonnegative Wonderful Compactification
Xuhua He, Kaitao Xie
Let be a split real semisimple group of adjoint type. We prove that the cellular decomposition of the totally nonnegative part of its wonderful compactification is a regular CW…
math.RT2026
Total positivity in twisted flag varieties
Xuhua He, Kaitao Xie
Let be a Kac-Moody group, split over . The totally nonnegative part of and its (ordinary) flag variety was introduced by Lusztig. It is known that the to…