On the Frobenius direct image of the structure sheaf of a homogeneous projective variety
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DOI: 10.1016/j.jalgebra.2018.07.003
Abstract: Abstract We present an example of a homogeneous projective variety the Frobenius direct image of the structure sheaf of which has nonvanishing self extension. read more here.
Keywords: projective variety; image structure; homogeneous projective; direct image ... See more keywords
Homogeneous Projective Coordinates for the Bondi–Metzner–Sachs Group
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DOI: 10.3390/sym16070867
Abstract: This paper studies the Bondi–Metzner–Sachs group in homogeneous projective coordinates because it is then possible to write all transformations of such a group in a manifestly linear way. The 2-sphere metric, the Bondi–Metzner–Sachs metric, asymptotic… read more here.
Keywords: bondi metzner; metzner sachs; projective coordinates; group ... See more keywords