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TORIC VARIETIES
Acknowledgements Introduction and First Examples
The Projective Plane as a Toric Variety
Resolution of a Nonprojective Toric Variety
The Cox Ring of a Toric Variety
Fans in Toric Lattices
Construction of Fans
Components of Fans
Properties of Fans
Maps of Fans
Geometrical Properties of Cones and Polyhedra
Toric Varieties
Constructors for Toric Varieties
Toric Varieties and their Fans
Properties of Toric Varieties
Affine Patches on Toric Varieties
Cox Rings
The Cox Ring of a Toric Variety
Cox Rings in Their Own Right
Recovering a Toric Variety From a Cox Ring
Invariant Divisors and Riemann-Roch Spaces
Divisor Group
Constructing Invariant Divisors
Properties of Divisors
Linear Equivalence of Divisors
Riemann--Roch Spaces of Invariant Divisors
Maps of Toric Varieties
Maps from Lattice Maps
Properties of Toric Maps
The Geometry of Toric Varieties
Resolution of Singularities and Linear Systems
Mori Theory of Toric Varieties
Decomposition of Toric Morphisms
Schemes in Toric Varieties
Construction of Subschemes
Bibliography
Introduction and First Examples
The Projective Plane as a Toric Variety
Example Toric_toric-example1 (H129E1)
Resolution of a Nonprojective Toric Variety
Example Toric_toric-example10 (H129E2)
Example Toric_toric-divisor-scroll-example (H129E3)
Example Toric_toric-fano-index-example (H129E4)
The Cox Ring of a Toric Variety
Example Toric_cox-ring-example (H129E5)
Fans in Toric Lattices
Construction of Fans
Fan(Q) : [TorCon] -> TorFan
Fan(R,S) : [TorLatElt],[[RngIntElt]] -> TorFan
Fan(C) : TorCon -> TorFan
FanOfAffineSpace(n) : RngIntElt -> TorFac
FanOfWPS(W) : SeqEnum -> TorFan
[Future release] FanOfProjectiveSpace(n) : RngIntElt -> TorFac
FanOfFakeProjectiveSpace(W,Q) : SeqEnum, SeqEnum -> TorFan
ZeroFan(L) : TorLat -> TorFan
NormalFan(F,C) : TorFan,TorCon -> TorFan,Map
NormalFan(P) : TorPol -> TorFan
SpanningFan(P) : TorPol -> TorFan
Example Toric_toric-spanning-fan-example (H129E6)
FanWithWeights(W) : SeqEnum -> TorFan
Blowup(F,v): TorFan,TorLatElt -> TorFan
Example Toric_toric-fan-with-weights-example (H129E7)
IsInSupport(v,F) : TorLatElt,TorFan -> BoolElt,RngIntElt
OneSkeleton(F) : TorFan -> TorFan
Fan(F1,F2) : TorFan,TorFan -> TorFan
F eq G : TorFan,TorFan -> BoolElt
Components of Fans
Skeleton(F,n) : TorFan,RngIntElt -> TorFan
C in F : TorCon,TorFan -> BoolElt
Cones(F) : TorFan -> SeqEnum
Cones(F,i) : TorFan,RngIntElt -> SeqEnum
ConesOfCodimension(F,i) : TorFan,RngIntElt -> SeqEnum
MaxCones(F) : TorFan -> SeqEnum
AllCones(F) : TorFan -> SeqEnum
Cone(F,i) : TorFan,RngIntElt -> TorCon
Cone(F,S) : TorFan,[RngIntElt] -> TorCon
NonSimplicialCones(F) : TorFan -> SeqEnum, SeqEnum
SingularCones(F) : TorFan -> SeqEnum,SeqEnum
Example Toric_toric-singular-cones-example (H129E8)
ConeIndices(F) : TorFan -> SeqEnum
ConeIndices(F,C) : TorFan, TorCon -> SeqEnum
ConeIntersection(F,C1,C2) : TorFan,TorCon,TorCon -> TorCon
Face(F,C) : TorFan,TorCon -> TorCon
InnerNormals(F) : TorFan -> SeqEnum
DualFaceInDualFan(P,Q) : TorPol,[RngIntElt] -> TorFan
Rays(F) : TorFan -> SeqEnum
Ray(F,i) : TorFan,RngIntElt -> TorLatElt
AllRays(F) : TorFan -> SeqEnum
PureRays(F) : TorFan -> SeqEnum
PureRayIndices(F) : TorFan -> SeqEnum
CreateVirtualRays(S) : [TorLatElt] -> SeqEnum
VirtualRays(F) : TorFan -> SeqEnum
VirtualRayIndices(F) : TorFan -> SeqEnum
Properties of Fans
Ambient(F) : TorFan -> TorLat
IsComplete(F) : TorFan -> BoolElt
IsSingular(F) : TorFan -> BoolElt
IsNonsingular(F) : TorFan -> BoolElt
IsQFactorial(F) : TorFan -> BoolElt
IsIsolated(F) : TorFan -> BoolElt
IsTerminal(F) : TorFan -> BoolElt
IsCanonical(F) : TorFan -> BoolElt
IsGorenstein(F) : TorFan -> BoolElt
IsQGorenstein(F) : TorFan -> BoolElt
Maps of Fans
F @ f : TorFan,Map -> TorFan
SimplicialSubdivision(F) : TorFan -> TorFan
Example Toric_toric-simplicial-example (H129E9)
IsFanMap(F1,F2) : TorFan,TorFan -> BoolElt
IsFanMap(F1,F2,f) : TorFan,TorFan,Map -> BoolElt
ResolveFanMap(F1,F2) : TorFan,TorFan -> TorFan
Resolution(F) : TorFan -> TorFan
Terminalisation(F) : TorFan -> TorFan
Canonicalisation(F) : TorFan -> TorFan
Geometrical Properties of Cones and Polyhedra
IsSingular(C) : TorCon -> BoolElt
IsNonsingular(C) : TorCon -> BoolElt
IsSmooth(P) : TorPol -> BoolElt
IsGorenstein(C) : TorCon -> BoolElt
IsReflexive(P) : TorPol -> BoolElt
IsQGorenstein(C) : TorCon -> BoolElt
GorensteinIndex(C) : TorCon -> RngIntElt,TorLatElt
GorensteinIndex(P) : TorPol -> RngIntElt
IsIsolated(C) : TorCon -> BoolElt
IsQFactorial(C) : TorCon -> BoolElt
IsTerminal(C) : TorCon -> BoolElt
IsCanonical(C) : TorCon -> BoolElt
IsFano(P) : TorPol -> BoolElt
Example Toric_toric-terminal-polytope-example (H129E10)
Toric Varieties
Constructors for Toric Varieties
ToricVariety(k,n) : Fld,RngIntElt -> TorVar
ToricVariety(k,Z) : Fld,[RngIntElt] -> TorVar
ToricVariety(k,Z,Q) : Fld,[RngIntElt],[FldRatElt] -> TorVar
ToricVariety(k,M,v) : Fld,[[RngIntElt]],[RngIntElt] -> TorVar
Example Toric_toric-cox-example2 (H129E11)
ToricVariety(k) : Fld -> TorVar
ProjectiveSpace(k,n) : Fld,RngIntElt -> Prj
ProjectiveSpace(k,W) : Fld,[RngIntElt] -> Prj
AbsoluteRationalScroll(k,S) : Fld,[RngIntElt] -> TorVar
RationalScroll(k,s,A) : Fld, RngIntElt, [RngIntElt] -> TorVar
RuledSurface(k,n) : Fld, RngIntElt -> TorVar
RuledSurface(k,a1,a2) : Fld, RngIntElt, RngIntElt -> TorVar
HirzebruchSurface(k,n) : Fld, RngIntElt -> TorVar
BigTorus(k,N) : Rng,TorLat -> TorVar
BigTorus(X) : TorVar -> TorVar, TorMap, TorMap
RestrictionToSubtorus(Z) : Sch -> Sch, TorMap
Toric Varieties and their Fans
ToricVariety(k,F) : Fld,TorFan -> TorVar
Fan(X) : TorVar -> TorLat
Rays(X) : TorVar -> SeqEnum
OneParameterSubgroupsLattice(X) : TorVar -> TorLat
MonomialLattice(X) : TorVar -> TorLat
CoxMonomialLattice(X) : TorVar -> TorLat
PicardLattice(X) : TorVar -> TorLat
DivisorClassLattice(X) : TorVar -> TorLat
IrrelevantIdeal(X) : TorVar -> SeqEnum
Gradings(X) : Sch -> SeqEnum
NumberOfGradings(X) : Sch -> RngIntElt
QuotientGradings(X) : TorVar -> SeqEnum
NumberOfQuotientGradings(X) : TorVar -> RngIntElt
Properties of Toric Varieties
IsSingular(X) : TorVar -> BoolElt
IsNonsingular(X) : TorVar -> BoolElt
IsGorenstein(X) : TorVar -> BoolElt
IsQGorenstein(X) : TorVar -> BoolElt
IsQFactorial(X) : TorVar -> BoolElt
IsIsolated(X) : TorVar -> BoolElt
IsTerminal(X) : TorVar -> BoolElt
IsCanonical(X) : TorVar -> BoolElt
IsComplete(X) : TorVar -> BoolElt
IsProjective(X) : TorVar -> BoolElt
IsFano(X) : TorVar -> BoolElt
IsWeakFano(X) : TorVar -> BoolElt
IsFakeWeightedProjectiveSpace(X) : TorVar -> BoolElt
IsWeightedProjectiveSpace(X) : TorVar -> BoolElt
Affine Patches on Toric Varieties
ToricAffinePatch(X,i) : TorVar,RngIntElt -> TorVar,TorMap
ToricAffinePatch(X,S) : TorVar,[RngIntElt] -> TorVar,TorMap
Cox Rings
The Cox Ring of a Toric Variety
CoxRing(X) : TorVar -> RngCox
CoxRing(k,F) : Fld,TorFan -> RngCox
Example Toric_toric-cox-example1 (H129E12)
Example Toric_toric-cox-example2 (H129E13)
Cox Rings in Their Own Right
CoxRing(R,B,Z,Q) : RngMPol,SeqEnum,SeqEnum,SeqEnum -> RngCox
C1 eq C2 : RngCox,RngCox -> BoolElt
BaseRing(C) : RngCox -> Fld
UnderlyingRing(C) : RngCox -> RngMPol
Length(C) : RngCox -> RngIntElt
IrrelevantIdeal(C) : RngCox -> SeqEnum
IrrelevantComponents(C) : RngCox -> SeqEnum
IrrelevantGenerators(C) : RngCox -> SeqEnum
Gradings(C) : RngCox -> RngIntElt
NumberOfGradings(C) : RngCox -> RngIntElt
QuotientGradings(C) : RngCox -> RngIntElt
NumberOfQuotientGradings(C) : RngCox -> RngIntElt
C . i : RngCox, RngInt -> RngMPolElt
AssignNames(~C, S) : RngCox, [MonStgElt] ->
Name(C,i) : RngCox,RngIntElt -> RngMPolElt
Recovering a Toric Variety From a Cox Ring
ToricVariety(C) : RngCox -> TorVar
Example Toric_toric-from-cox-example (H129E14)
Fan(C) : RngCox -> TorFan
CoxMonomialLattice(C) : RngCox -> TorLat
BasisOfRationalFunctionField(X) : TorVar -> SeqEnum
BasisOfDegree0CoxMonomials(X) : TorVar -> SeqEnum
DivisorClassLattice(C) : RngCox -> TorLat
MonomialLattice(C) : RngCox -> TorLat
OneParameterSubgroupsLattice(C) : RngCox -> TorLat
RayLattice(C) : RngCox -> TorLat
DivisorClassGroup(C) : RngCox -> TorLat
RayLatticeMap(C) : RngCox -> Map
WeilToClassGroupsMap(C) : RngCox -> Map
Invariant Divisors and Riemann-Roch Spaces
Divisor Group
DivisorGroup(X) : TorVar -> DivTor
ToricVariety(G) : DivTor -> TorVar
G1 eq G2 : DivTor,DivTor -> BoolElt
Divisor(G,S) : DivTor,[RngIntElt] -> DivTorElt
Divisor(G,i) : DivTor,RngIntElt -> DivTorElt
Constructing Invariant Divisors
Divisor(X,S) : TorVar,[RngIntElt] -> DivTorElt
Divisor(X,i) : TorVar,RngIntElt -> DivTorElt
Divisor(X,f) : TorVar,RngMPolElt -> DivTorElt
Divisor(X,m) : TorVar,TorLatElt -> DivTorElt
ZeroDivisor(X) : TorVar -> DivTorElt
Representative(X,m) : TorVar,ModEDElt -> DivTorElt
Representative(X,m) : TorVar,TorLatElt -> DivTorElt
CanonicalDivisor(X) : TorVar -> DivTorElt
CanonicalClass(X) : TorVar -> DivTorElt
Example Toric_toric-kawamata-blowup-example (H129E15)
Properties of Divisors
Variety(D) : DivTorElt -> TorVar
Parent(D) : DivTorElt -> DivTor
Weil(D) : DivTorElt -> SeqEnum
Cartier(D) : DivTorElt -> SeqEnum[TorLatElt]
IsQCartier(D) : DivTorElt -> BoolElt
IsCartier(D) : DivTorElt -> BoolElt
IsWeil(D) : DivTorElt -> BoolElt
IsAmple(D) : DivTorElt -> BoolElt
IsNef(D) : DivTorElt -> BoolElt
IsBig(D) : DivTorElt -> BoolElt
IsEffective(D) : DivTorElt -> BoolElt
PicardClass(D) : DivTorElt -> TorLatElt
MovablePart(D) : DivTorElt -> DivTorElt
Example Toric_toric-movable-example (H129E16)
ImageFan(D) : DivTorElt -> TorFan
Proj(D) : DivTorElt -> TorVar, PlcEnum
RelativeProj(D) : DivTorElt -> TorVar
IntersectionForm(X,C) : TorVar,TorCon -> TorLatElt
IntersectionForms(X) : TorVar -> [TorLatElt]
CartierToWeilMap(X) : TorVar -> Map
PicardToClassGroupsMap(X) : TorVar -> Map
PicardToClassLatticesMap(X) : TorVar -> Map
Linear Equivalence of Divisors
IsQPrincipal(D) : DivTorElt -> BoolElt
IsPrincipal(D) : DivTorElt -> BoolElt
IsLinearlyEquivalentToCartier(D) : DivTorElt -> BoolElt, DivTorElt
AreLinearlyEquivalent(D,E) : DivTorElt,DivTorElt -> BoolElt
LinearlyEquivalentDivisorWithNoSupportOn(D,S) : DivTorElt,[RngMPolElt] -> DivTorElt
DefiningMonomial(D) : DivTorElt -> RngMPolElt
LatticeElementToMonomial(D,v) : DivTorElt,TorLatElt -> RngMPolElt
Riemann--Roch Spaces of Invariant Divisors
RiemannRochPolytope(D) : DivTorElt -> TorPol
RiemannRochBasis(D) : DivTorElt -> [RngElt]
RiemannRochDimension(D) : DivTorElt -> RngIntElt
GradedCone(D) : DivTorElt -> TorCon
Polyhedron(D) : DivTorElt -> TorPol
Example Toric_toric-rr-example (H129E17)
HilbertSeries(D) : DivTor -> FldFunRatUElt
HilbertPolynomial(D) : DivTor -> [RngUPolElt]
HilbertCoefficients(D,l) : DivTor,RngIntElt -> [RngIntElt]
HilbertCoefficient(D,i) : DivTor,RngIntElt -> RngIntElt
HilbertDeltaVector(D) : DivTor -> [RngIntElt]
Example Toric_toric-rr-by-hand (H129E18)
Maps of Toric Varieties
Maps from Lattice Maps
ToricVarietyMap(X,Y,f) : TorVar,TorVar,Map -> TorMap
Blowup(X,v) : TorVar,TorLatElt -> TorVar,TorMap
ToricIdentityMap(X) : TorVar -> TorMap
Properties of Toric Maps
IsRegular(f) : TorMap -> BoolElt
IndeterminacyLocus(f) : TorMap -> [Sch]
Example Toric_toric-simplicial-example (H129E19)
The Geometry of Toric Varieties
Resolution of Singularities and Linear Systems
Resolution(X) : TorVar -> TorVar,TorMap
QFactorialisation(X) : TorVar -> TorVar, TorMap
Terminalisation(X) : TorVar -> TorVar, TorMap
Canonicalisation(X) : TorVar -> TorVar, TorMap
ResolveLinearSystem(D) : DivTorElt -> TorVar
Mori Theory of Toric Varieties
MoriCone(X) : TorVar -> TorCon
NefCone(X) : TorVar -> TorCon
ExtremalRays(X) : TorVar -> SeqEnum
ExtremalRayContraction(X,i) : TorVar,RngIntElt -> TorVar,TorMap
ExtremalRayContractionDivisor(X,i) : TorVar,RngIntElt -> DivTorElt
TypeOfContraction(X,i) : TorVar,RngIntElt -> MonStgElt
IsDivisorialContraction(X,i) : TorVar,RngIntElt -> BoolElt
IsMoriFibreSpace(X,i) : TorVar,RngIntElt -> BoolElt
IsFlipping(X,i) : TorVar,RngIntElt -> BoolElt
Flip(X,i) : TorVar,RngIntElt -> TorVar
Flip(D) : DivTorElt -> TorVar
WeightsOfFlip(X,i) : TorVar,RngIntElt -> SeqEnum
Example Toric_toric-flipwts-example (H129E20)
Example Toric_toric-weights-of-flip-example (H129E21)
MMP(X) : TorVar -> SeqEnum,SeqEnum
Example Toric_toric-mmp-example1 (H129E22)
Decomposition of Toric Morphisms
Example Toric_toric-decomposition-example (H129E23)
Schemes in Toric Varieties
Construction of Subschemes
Scheme(X,f) : TorVar,RngMPolElt -> Sch
Scheme(X,Q) : TorVar,[RngMPolElt] -> Sch
BinomialToricEmbedding(Z) : Sch -> Sch, TorMap
Example Toric_toric-mmp-example1 (H129E24)
Bibliography
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