5 papers
Geometrically L^p-optimal lines of vertices of an equilateral triangle
Annett Puettmann
We consider the distances between a line and a set of points in the plane defined by the L^p-norms of the vector consisting of the euclidian distance between the single points and…
Fitting lines to points in the plane
Annett Puettmann
We seek for lines of minimal distance to finitely many points in the plane. The distance between a line and a set of points is defined by the L^p-norm, 1\leq p\leq \infty, of the v…
Chow points of C-orbits
Annett Puettmann
We consider free algebraic actions of the additive group of complex numbers on a complex vector space X embedded in the complex projective space. We find an explicit formula for th…
Biquotient actions on unipotent Lie groups
Annett Puettmann
We consider pairs (V,H) of subgroups of a connected unipotent complex Lie group G for which the induced VxH-action on G by multiplication from the left and from the right is free.…
Antiholomorphic involutions of spherical complex spaces
Dmitri Akhiezer, Annett Puettmann
Let X be a holomorphically separable irreducible reduced complex space, K a connected compact Lie group acting on X by holomorphic transformations, theta : K -> K a Weyl involution…