1 citations · 1 across the 3 of their papers we have counts for
4 papers
Complex planar curves homeomorphic to a line have at most four singular points
Mariusz Koras, Karol Palka
We show that a complex planar curve homeomorphic to the projective line has at most four singular points. If it has exactly four then it has degree five and is unique up to a proje…
Affine threefolds admitting -actions
R. V. Gurjar, M. Koras, M. Miyanishi +1
Affine varieties of dimension greater than two can be explored their structures with the help of fibrations by the affine line or plane and quotient morphisms by -act…
-fibrations on affine threefolds
R. V. Gurjar, M. Koras, K. Masuda +2
The affine line minus one point is the underlying space of the algebraic torus of dimension one. However the fibration of an affine algebraic threefold by the affine line minus one…
A homology plane of general type can have at most a cyclic quotient singularity
R. V. Gurjar, M. Koras, M. Miyanishi +1
We show that a homology plane of general type has at worst a single cyclic quotient singular point. An example of such a surface with a singular point does exist. We also show that…