############################################################################# ## #W rcwamono.gd GAP4 Package `RCWA' Stefan Kohl ## ## This file contains declarations of functions, operations etc. for ## computing with rcwa monoids. ## ## See the definitions given in the file rcwamap.gd. ## #############################################################################
############################################################################# ## #C IsRcwaMonoidOverZ . . . . . . . . . . . . . . . . . . rcwa monoids over Z #C IsRcwaMonoidOverZxZ . . . . . . . . . . . . . . . . rcwa monoids over Z^2 #C IsRcwaMonoidOverZ_pi . . . . . . . . . . . . . rcwa monoids over Z_(pi) #C IsRcwaMonoidOverGFqx . . . . . . . . . . . . rcwa monoids over GF(q)[x] #C IsRcwaMonoidOverZOrZ_pi . . . . . . . . . . rcwa monoids over Z or Z_(pi) ## ## The category of all rcwa monoids over Z, over Z^2, over semilocalizations ## of Z or over polynomial rings in one variable over a finite field, ## respectively. The category `IsRcwaMonoidOverZOrZ_pi' is the union of ## `IsRcwaMonoidOverZ' and `IsRcwaMonoidOverZ_pi'. ##
DeclareSynonym( "IsRcwaMonoidOverZ",
CategoryCollections(IsRcwaMappingOfZ) and IsMonoid );
DeclareSynonym( "IsRcwaMonoidOverZxZ",
CategoryCollections(IsRcwaMappingOfZxZ) and IsMonoid );
DeclareSynonym( "IsRcwaMonoidOverZ_pi",
CategoryCollections(IsRcwaMappingOfZ_pi) and IsMonoid );
DeclareSynonym( "IsRcwaMonoidOverGFqx",
CategoryCollections(IsRcwaMappingOfGFqx) and IsMonoid );
DeclareSynonym( "IsRcwaMonoidOverZOrZ_pi",
CategoryCollections(IsRcwaMappingOfZOrZ_pi) and IsMonoid );
############################################################################# ## #O RcwaCons( <R> ) . . . . . . . . . . . . . . . . . . Rcwa( R ) for ring R #F Rcwa( <R> ) ## ## The monoid formed by all rcwa mappings of <R>. ##
DeclareConstructor( "RcwaCons", [ IsRcwaMonoid, IsDomain ] );
DeclareGlobalFunction( "Rcwa" );
############################################################################# ## #A ModulusOfRcwaMonoid( <M> ) . . . . . . . . modulus of the rcwa monoid <M> ## ## We define the *modulus* of an rcwa monoid by the lcm of the moduli of its ## elements in case such an lcm exists, and by 0 otherwise. ##
DeclareAttribute( "ModulusOfRcwaMonoid", IsRcwaMonoid );
############################################################################# ## #O Ball( <M>, <f>, <r> ) ball of radius <r> around the element <f> of <M> #O Ball( <M>, <p>, <r>, <act> ) " the point <p> under the action of <M> #O Ball( <M>, <p>, <r> ) . . . as above, where <act> defaults to `OnPoints' #O RestrictedBall( <M>, <f>, <r>, <modulusbound> ) . . . . "restricted" ball #O RestrictedBall( <M>, <p>, <r>, <act>, <bound> ) . . . . . . . . . (dito) #O RestrictedBall( <M>, <p>, <r>, <bound> ) . . . . . . . . . . . . (dito) #O RestrictedBall( <M>, <f>, <r>, <bounds> ) . . . . . . . . . . . . (dito) ## ## The first variant returns the ball of radius <r> about the element <f> ## of <M>. ## ## The second variant returns the ball of radius <r> about the point <p> ## under the action of <M>. ## ## The third variant is the same as the second -- ## <act> defaults to `OnPoints'. ## ## The fourth variant does the same as the first except that it stops ## where extending the ball would yield elements whose moduli exceed the ## bound <modulusbound>. ## ## The fifth variant does the same as the second except that it stops ## where further extending the ball would yield points which exceed the ## bound <bound> in absolute value. If the points are tuples, then the ## bound applies to all coordinates. ## ## The sixth variant is the fifth -- <act> defaults to `OnPoints'. ## ## All balls are understood w.r.t. the stored generators of the monoid <M>, ## respectively w.r.t. the stored generators and their inverses if <M> is ## actually a group. ## ## An option `Spheres' is recognized. If set, the returned ball is split ## into a list of spheres. ##
DeclareOperation( "Ball", [ IsMonoid, IsObject, IsInt ] );
DeclareOperation( "Ball", [ IsMonoid, IsObject, IsInt, IsFunction ] );
DeclareOperation( "RestrictedBall",
[ IsMonoid, IsObject, IsObject, IsObject ] );
DeclareOperation( "RestrictedBall",
[ IsMonoid, IsObject, IsObject, IsObject, IsObject ] );
############################################################################# ## #O ShortOrbits( <G>, <S>, <maxlng> ) . . . . short orbits of rcwa group <G> #O ShortOrbits( <G>, <S>, <maxlng>, <maxn> ) . dito, with upper bound <maxn> #O ShortOrbits( <M>, <S>, <maxlng> ) short forward orbits of rcwa monoid <M> ## ## In the first case, this operation returns a list of all finite orbits of ## the rcwa group <G> of length <= <maxlng>, which intersect nontrivially ## with the set <S>. ## In the second case, it returns a list of all such orbits which do not ## contain a point larger than <maxn>. ## In the third case, it returns a list of all finite forward orbits with ## starting point within the set <S>, of length <= <maxlng>. ##
DeclareOperation( "ShortOrbits", [ IsMonoid, IsListOrCollection, IsInt ] );
DeclareOperation( "ShortOrbits", [ IsMonoid, IsListOrCollection, IsInt,
IsInt ] );
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