most citedLeft invariant Lorentzian metrics and curvatures on non-unimodular Lie groups of dimension three

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math.DG2022★ 1 cited

Left invariant Lorentzian metrics and curvatures on non-unimodular Lie groups of dimension three

Ku Yong Ha, Jong Bum Lee

For each connected and simply connected three-dimensional non-unimodular Lie group, we classify the left invariant Lorentzian metrics up to automorphism, and study the extent to wh…

math.AT2014

The property for crystallographic group of Sol

Ku Yong Ha, Jong Bum Lee

There are 9 kinds of crystallographic groups of Sol. For any automorphism on , we study the Reidemeister number . Using the averaging formula for the Reidemeister…