Results 31 to 40 of about 471 (42)

Equivalent Birational Embeddings III: cones [PDF]

open access: yes, 2013
Two divisors in $\mathbb P^n$ are said to be Cremona equivalent if there is a Cremona modification sending one to the other. In this paper I study irreducible cones in $\mathbb P^n$ and prove that two cones are Cremona equivalent if their general ...
Mella, Massimiliano
core  

On the Iitaka fibration of varieties of maximal Albanese dimension

open access: yes, 2012
We prove that the tetracanonical map of a variety $X$ of maximal Albanese dimension induces the Iitaka fibration.
Jiang, Zhi   +2 more
core   +1 more source

The indeterminacy locus of the Voisin map

open access: yes, 2019
Beauville and Donagi proved that the variety of lines $F(Y)$ of a smooth cubic fourfold $Y$ is a hyperk\"ahler variety. Recently, C. Lehn, M.Lehn, Sorger and van Straten proved that one can naturally associate a hyperK\"ahler variety $Z(Y)$ to the ...
Muratore, Giosuè Emanuele
core   +1 more source

Computation-free presentation of the fundamental group of generic $(p,q)$-torus curves

open access: yes, 2012
In this note, we present a new method for computing fundamental groups of curve complements using a variation of the Zariski-Van Kampen method on general ruled surfaces.
Bartolo, Enrique Artal   +2 more
core   +1 more source

The relative pluricanonical stability for 3-folds of general type [PDF]

open access: yes, 1999
This paper aims to improve a theorem of Janos Kollar. For a given Complex projective threefold X of general type, suppose the plurigenus p_k(X)\ge 2, Kollar proved that the (11k+5)-canonical map is birational.
Chen, Meng
core   +1 more source

Reduction of manifolds with semi-negative holomorphic sectional curvature

open access: yes, 2017
In this note, we continue the investigation of a projective K\"ahler manifold $M$ of semi-negative holomorphic sectional curvature $H$. We introduce a new differential geometric numerical rank invariant which measures the number of linearly independent {\
Heier, Gordon   +3 more
core  

Towards the classification of weak Fano threefolds with ρ = 2

open access: yesOpen Mathematics, 2013
Cutrone Joseph, Marshburn Nicholas
doaj   +1 more source

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