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math.GT2013
Infra-solvmanifolds of $\Sol_1^4$-geometry
Kyung-Bai Lee, Scott Thuong
The purpose of this paper is to classify all compact manifolds modeled on the 4-dimensional solvable Lie group . The maximal compact subgroup of is $D_4=\m…
math.GT2010
SO(n)\SO_0(n,1) has Positive Curvatures
Taechang Byun, Kyeonghee Jo, Kyung Bai Lee
The Lie group SO_0(n, 1) has the left-invariant metric coming from the Killing-Cartan form. The maximal compact subgroup SO(n) of the isometry group acts from the left. The geometr…