regina Namespace Reference

Contains the entire Regina calculation engine. More...

Classes
class	NAbelianGroup
	Represents a finitely generated abelian group. More...
struct	NGroupExpressionTerm
	Represents a power of a generator in a group presentation. More...
class	NGroupExpression
	Represents an expression involving generators from a group presentation. More...
class	NGroupPresentation
	Represents a finite presentation of a group. More...
class	NXMLAbelianGroupReader
	An XML element reader that reads a single abelian group. More...
class	NXMLGroupPresentationReader
	An XML element reader that reads a single group presentation. More...
class	NAngleStructureVector
	A vector of integers used to indirectly store the individual angles in an angle structure. More...
class	NAngleStructure
	Represents an angle structure on a triangulation. More...
class	NAngleStructureList
	A packet representing a collection of angle structures on a triangulation. More...
class	NXMLAngleStructureReader
	An XML element reader that reads a single angle structure. More...
class	NXMLAngleStructureListReader
	An XML packet reader that reads a single angle structure list. More...
class	NCensus
	A utility class used to form a complete census of 3-manifold triangulations satisfying certain constraints. More...
class	NFacePairing
	Represents a specific pairwise matching of tetrahedron faces. More...
class	NGluingPerms
	Represents a specific set of gluing permutations to complement a particular pairwise matching of tetrahedron faces. More...
class	NCompConstraint
	Represents an individual compatibility constraint for use with polytope vertex enumeration. More...
class	NCompConstraintSet
	Represents a set of compatibility constraints for use with polytope vertex enumeration. More...
class	NDoubleDescriptor
	Implements a modified double descriptor method for polytope vertex enumeration. More...
class	NVertexEnumerator
	An abstract base class for use with different polytope vertex enumeration algorithms. More...
class	NFile
	Represents an old-style binary file containing a packet tree. More...
class	NFileInfo
	Stores information about a Regina data file, including file type and version. More...
class	NFilePropertyReader
	Assists with reading individual object properties from old-style binary data files. More...
class	NRandomAccessResource
	Provides a standard random access interface for old-style binary file-like resources. More...
class	NLocalFileResource
	A random access resource that is simply a local file. More...
class	NXMLCallback
	Provides the callbacks for an XMLParser required to parse an entire file using a series of NXMLElementReader objects. More...
class	NXMLElementReader
	Used to read the contents of a single XML element. More...
class	NXMLCharsReader
	A reader for an XML element that contains only characters. More...
class	NKnot
	Represents knots and links in S^3 and allows the construction of triangulations from them. More...
class	NHandlebody
	Represents an arbitrary handlebody. More...
class	NLensSpace
	Represents a general Lens space. More...
class	NManifold
	Represents a particular 3-manifold. More...
struct	NExceptionalFibre
	Represents an exceptional (alpha, beta) fibre in a Seifert fibred space. More...
class	NSFS
	Represents a general orientable Seifert fibred space. More...
class	NSimpleSurfaceBundle
	Represents a particularly simple closed surface bundle over the circle. More...
class	NMatrix
	Represents a matrix of elements of the given type T. More...
class	NMatrixRing
	Represents a matrix of elements from a given ring T. More...
class	NMatrixField
	Represents a matrix of elements from a given field T. More...
class	NMatrixInt
	Represents a matrix of arbitrary precision integers. More...
class	NRay
	Represents a ray rooted at the origin whose coordinates are rational. More...
class	NVector
	A vector of elements from a given ring T. More...
class	NVectorDense
	A dense vector of objects of type T. More...
class	NVectorMatrix_Illegal_Modification
	An exception thrown when a matrix row or column vector is modified. More...
class	NVectorMatrix
	A vector that corresponds to a row or column of a matrix. More...
class	NVectorMatrixRow
	A vector that corresponds to a row of a matrix. More...
class	NVectorMatrixCol
	A vector that corresponds to a column of a matrix. More...
class	NVectorUnit_Illegal_Modification
	An exception thrown when a unit vector is modified. More...
class	NVectorUnit
	A unit vector of type T. More...
class	NContainer
	A packet that simply contains other packets. More...
class	NPacket
	Represents a packet of information that may be individually edited or operated upon. More...
class	NPacketListener
	An object that can be registered to listen for packet events. More...
class	NScript
	A packet representing a script that can be run. More...
class	NText
	A packet representing a text string. More...
class	NXMLPacketReader
	An XML element reader that reads the data for an individual packet. More...
class	NXMLContainerReader
	An XML packet reader that reads a single container. More...
class	NXMLScriptReader
	An XML packet reader that reads a single script. More...
class	NXMLTextReader
	An XML packet reader that reads a single text packet. More...
class	NProgress
	An object through which external interfaces can obtain progress reports when running long calculations. More...
class	NProgressFinished
	A progress report that immediately claims it is finished. More...
class	NProgressManager
	Manages the sharing of an NProgress object between reading and writing threads. More...
class	NProgressMessage
	A progress report in which the current state of progress is stored as a string message. More...
struct	NProgressStateNumeric
	A simple structure used for passing around a numeric state of progress. More...
class	NProgressNumber
	A progress report in which the current state of progress is stored as a number of items completed. More...
class	ShareableObject
	Facilitates mirroring objects in the underlying C++ calculation engine using the various wrapper classes provided in the various external interfaces (such as the Python interface). More...
class	NSigCensus
	A utility class used by formSigCensus(). More...
class	NSigPartialIsomorphism
	Represents a partial isomorphism between two splitting surface signatures. More...
class	NSignature
	Represents a signature of a splitting surface in a closed 3-manifold triangulation. More...
class	NAugTriSolidTorus
	Represents an augmented triangular solid torus component of a triangulation. More...
class	NL31Pillow
	Represents a triangular pillow L(3,1) component of a triangulation. More...
class	NLayeredChain
	Represents a layered chain in a triangulation. More...
class	NLayeredChainPair
	Represents a layered chain pair component of a triangulation. More...
class	NLayeredLensSpace
	Represents a layered lens space component of a triangulation. More...
class	NLayeredLoop
	Represents a layered loop component of a triangulation. More...
class	NLayeredSolidTorus
	Represents a layered solid torus in a triangulation. More...
class	NPillowTwoSphere
	Represents a 2-sphere made from two faces glued together along their three edges. More...
class	NPlugTriSolidTorus
	Represents a plugged triangular solid torus component of a triangulation. More...
class	NSnappedBall
	Represents a snapped 3-ball in a triangulation. More...
class	NSnappedTwoSphere
	Represents a 2-sphere made from two snapped 3-balls in a triangulation. More...
class	NSpiralSolidTorus
	Represents a spiralled solid torus in a triangulation. More...
class	NStandardTriangulation
	Describes a triangulation or subcomplex of a triangulation whose structure is well-understood. More...
class	NTriSolidTorus
	Represents a three-tetrahedron triangular solid torus in a triangulation. More...
class	NTrivialTri
	Represents one of a few particular trivial triangulations that do not belong to any of the other larger families. More...
struct	NDiscSpec
	Specifies a single normal disc in a normal surface. More...
class	NDiscSetTet
	Represents a set of normal discs inside a single tetrahedron. More...
class	NDiscSetTetData
	Stores data of type T for every normal disc inside a single tetrahedron. More...
class	NDiscSetSurface
	Represents the set of all normal discs forming a normal surface. More...
class	NDiscSetSurfaceData
	Stores data of type T for every normal disc within a particular normal surface. More...
class	NDiscSpecIterator
	An iterator used for running through all normal discs in a normal surface. More...
class	NNormalSurfaceVector
	Stores the vector of a single normal surface in a 3-manifold. More...
class	NNormalSurface
	Represents a single normal surface in a 3-manifold. More...
class	NNormalSurfaceList
	A packet representing a collection of normal surfaces in a 3-manifold. More...
struct	NPrismSpec
	Specifies a single triangular prism in a tetrahedron. More...
class	NPrismSetSurface
	Represents the set of prisms defined by slicing along all the quads in a particular normal surface. More...
class	NNormalSurfaceVectorANStandard
	An almost normal surface vector using standard triangle-quad-oct coordinates. More...
class	NNormalSurfaceVectorMirrored
	A normal surface vector that is mirrored in another coordinate system to avoid frequent lengthy calculations. More...
class	NNormalSurfaceVectorQuad
	A normal surface vector using quad coordinates. More...
class	NNormalSurfaceVectorStandard
	A normal surface vector using standard triangle-quad coordinates. More...
class	NSurfaceFilter
	A packet that accepts or rejects normal surfaces. More...
class	NSurfaceSet
	Represents a collection of normal surfaces in a 3-manifold. More...
class	NSurfaceSubset
	Represents a subset of a normal surface set. More...
class	NXMLFilterReader
	An XML element reader that reads the specific details of a normal surface filter. More...
class	NXMLFilterPacketReader
	An XML packet reader that reads a single surface filter. More...
class	NXMLNormalSurfaceReader
	An XML element reader that reads a single normal surface. More...
class	NXMLNormalSurfaceListReader
	An XML packet reader that reads a single normal surface list. More...
class	NSurfaceFilterCombination
	A normal surface filter that simply combines other filters. More...
class	NSurfaceFilterProperties
	A normal surface filter that filters by basic properties of the normal surface. More...
class	NBoundaryComponent
	Represents a component of the boundary of a triangulation. More...
class	NComponent
	Represents a component of a triangulation. More...
class	NEdgeEmbedding
	Details how an edge in the skeleton forms part of an individual tetrahedron. More...
class	NEdge
	Represents an edge in the skeleton of a triangulation. More...
class	NFaceEmbedding
	Details how a face in the skeleton forms part of an individual tetrahedron. More...
class	NFace
	Represents a face in the skeleton of a triangulation. More...
class	NFacePair
	Represents a pair of tetrahedron face numbers. More...
class	NIsomorphism
	Represents a combinatorial isomorphism from one triangulation into another. More...
class	NIsomorphismDirect
	An isomorphism in which face permutations are stored directly. More...
class	NIsomorphismIndexed
	An isomorphism in which face permutations are stored as indices into the allPermsS4 array. More...
class	NPerm
	Represents a permutation of {0,1,2,3}. More...
class	NPermItS4
	An iterator class that runs through all 24 permutations of four elements. More...
struct	NTetFace
	A lightweight class used to refer to a particular face of a particular tetrahedron. More...
class	NTetrahedron
	Represents a tetrahedron in a triangulation. More...
class	NTriangulation
	Stores the triangulation of a 3-manifold along with its various cellular structures and other information. More...
class	NVertexEmbedding
	Details how a vertex in the skeleton forms part of an individual tetrahedron. More...
class	NVertex
	Represents a vertex in the skeleton of a triangulation. More...
class	NXMLTriangulationReader
	An XML packet reader that reads a single triangulation. More...
struct	HashPointer
	A hash function used to calculate hash values for arbitrary pointers. More...
struct	HashString
	A hash function used to calculate hash values for C++ strings. More...
struct	FuncNew
	An adaptable generator used to create objects using default constructors. More...
struct	FuncNewCopyPtr
	An adaptable unary function used to create objects using copy constructors. More...
struct	FuncNewCopyRef
	An adaptable unary function used to create objects using copy constructors. More...
struct	FuncNewClonePtr
	An adaptable unary function used to create objects using the clone() method. More...
struct	FuncDelete
	An adaptable unary function used to deallocate objects. More...
class	NTriBool
	A three-way extension of the boolean type. More...
class	NTriBool_Illegal_Integer_Conversion
	An exception thrown when an illegal integer conversion is attempted with NTriBool. More...
class	NBoolSet
	A set of booleans. More...
class	NIndexedArray
	A dynamically resizable array of objects of type T with fast random access and fast object-to-index lookup. More...
class	NLargeInteger
	Represents an arbitrary precision integer. More...
class	StoreValue
	An NProperty storage policy indicating that the property should be held by value. More...
class	StoreConstPtr
	An NProperty storage policy indicating that the property should be held by constant pointer. More...
class	StoreManagedPtr
	An NProperty storage policy indicating that the property should be held by pointer and that the property wrapper will also take responsibility for memory management. More...
class	NPropertyBase
	A base class that provides routines shared by all properties, regardless of their individual NProperty template parameters. More...
class	NProperty
	Stores a calculable property of an object. More...
class	NRational
	Represents an arbitrary precision rational number. More...
class	NMutex
	A mutual exclusion device (mutex) used to ensure that different threads do not interfere when working with the same data. More...
class	NThread
	Provides very basic thread handling. More...
class	ZBuffer
	A common base class for compression/decompression stream buffers. More...
class	CompressionBuffer
	An output stream buffer that compresses data as it is written. More...
class	DecompressionBuffer
	An input stream buffer that decompresses data as it is read. More...
class	CompressionStream
	An output stream that compresses data as it is written. More...
class	DecompressionStream
	An input stream that decompresses data as it is read. More...
Namespaces
namespace	boost
	Miscellaneous utility classes taken or modified from the Boost C++ libraries.
namespace	python
	Utility classes and routines to assist with Python bindings for the calculation engine.
namespace	stl
	Miscellaneous utility classes and routines taken or modified from the Standard Template Library.
namespace	xml
	Various classes and routines for XML manipulation, some taken or modified from the libxml++ library.
Typedefs
typedef bool(*	AcceptTriangulation )(NTriangulation *, void *)
	A routine used to determine whether a particular triangulation should be included in a census.
typedef std::list< NIsomorphismDirect * >	NFacePairingIsoList
	A list of isomorphisms on pairwise matchings of tetrahedron faces.
typedef void(*	UseFacePairing )(const NFacePairing *, const NFacePairingIsoList *, void *)
	A routine used to do arbitrary processing upon a pairwise matching of tetrahedron faces and its automorphisms.
typedef void(*	UseGluingPerms )(const NGluingPerms *, void *)
	A routine used to do arbitrary processing upon a particular set of gluing permutations.
typedef std::list< NSigPartialIsomorphism * >	NSigIsoList
	A list of partial isomorphisms on splitting surface signatures.
typedef void(*	UseSignature )(const NSignature &, const NSigIsoList &, void *)
	A routine used to do arbitrary processing upon a splitting surface signature and its automorphisms.
typedef pthread_t	NThreadID
	The type used for a thread identifier.
Functions
std::ostream &	operator<< (std::ostream &out, const NGroupExpressionTerm &term)
	Writes the given term to the given output stream.
const char *	getVersionString ()
	Returns the full version number of this calculation engine.
int	getVersionMajor ()
	Returns the major version number of this calculation engine.
int	getVersionMinor ()
	Returns the minor version number of this calculation engine.
int	testEngine (int value)
	Tests to see if an interface can successfully communicate with the underlying C++ calculation engine.
NPacket *	readFromFile (const char *fileName)
	Reads a packet tree from the given old-style binary file doing everything in a single step.
bool	writeToFile (const char *fileName, NPacket *packet)
	Writes the given packet tree to the given old-style binary file doing everything in a single step.
bool	writeXMLFile (const char *fileName, NPacket *subtree, bool compressed=true)
	Writes the subtree with the given packet as matriarch to disk as a complete XML file.
NPacket *	readXMLFile (const char *fileName)
	Reads the packet tree stored in the given XML file.
NPacket *	readFileMagic (const std::string &fileName)
	Reads a packet tree from a file whose format is unknown.
NContainer *	readDehydrationList (const char *filename, unsigned colDehydrations=0, int colLabels=-1, unsigned long ignoreLines=0)
	Reads a list of dehydrated triangulations from the given text file.
NTriangulation *	readSnapPea (const char *filename)
	Reads a triangulation from the given SnapPea file.
bool	writeSnapPea (const char *filename, NTriangulation &tri)
	Writes the given triangulation to the given file in SnapPea format.
std::string	stringToToken (const char *str)
	Returns a token derived from the given string.
std::string	stringToToken (const std::string &str)
	Returns a token derived from the given string.
std::ostream &	operator<< (std::ostream &out, const NExceptionalFibre &f)
	Writes the given fibre in human-readable format to the given output stream.
template<class R>
bool	isZero (R x)
	Determines whether the given real or complex number is zero.
template<class R>
bool	isNonZero (R x)
	Determines whether the given real or complex number is non-zero.
template<class R>
bool	isPositive (R x)
	Determines whether the given real or complex number is strictly positive.
template<class R>
bool	isNegative (R x)
	Determines whether the given real or complex number is strictly negative.
template<class R>
bool	isNonNegative (R x)
	Determines whether the given real or complex number is non-negative.
template<class R>
bool	isNonPositive (R x)
	Determines whether the given real or complex number is non-positive.
void	smithNormalForm (NMatrixInt &matrix)
	Transforms the given integer matrix into Smith normal form.
NRay *	intersect (const NRay &pos, const NRay &neg, const NVector< NLargeInteger > &hyperplane)
	Returns a newly allocated ray representing the intersection of the hyperplane joining two given rays with the given additional hyperplane.
long	reducedMod (long k, long modBase)
	Reduces k modulo modBase to give the smallest possible absolute value.
unsigned long	gcd (unsigned long a, unsigned long b)
	Calculates the greatest common divisor of two given integers.
long	gcdWithCoeffs (long a, long b, long &u, long &v)
	Calculates the greatest common divisor of two given integers and finds the smallest coefficients with which these integers combine to give their gcd.
unsigned long	modularInverse (unsigned long n, unsigned long k)
	Calculates the multiplicative inverse of one integer modulo another.
void	factorise (unsigned long n, std::list< unsigned long > &factors)
	Calculates the prime factorisation of the given integer.
void	primesUpTo (const NLargeInteger &roof, std::list< NLargeInteger > &primes)
	Determines all primes up to and including the given upper bound.
template<class T>
std::ostream &	operator<< (std::ostream &out, const NVector< T > &vector)
	Writes the given vector to the given output stream.
unsigned long	formSigCensus (unsigned order, UseSignature use, void *useArgs=0)
	Forms a census of all splitting surface signatures of the given order.
std::ostream &	operator<< (std::ostream &out, const NDiscSpec &spec)
	Writes the given disc specifier to the given output stream.
bool	numberDiscsAwayFromVertex (int discType, int vertex)
	Determines whether or not normal discs of the given type are numbered away from the given vertex.
bool	discOrientationFollowsEdge (int discType, int vertex, int edgeStart, int edgeEnd)
	Determines whether or not the natural boundary orientation of a normal disc of the given type follows the given directed normal arc.
template<class RayOutputIterator, class FaceOutputIterator>
void	createNonNegativeCone (NTriangulation *triangulation, int flavour, RayOutputIterator rays, FaceOutputIterator faces)
	Writes to the given output iterators newly allocated rays and faces representing the cone in the given flavour of coordinate system obtained by setting all coordinates non-negative.
NMatrixInt *	makeMatchingEquations (NTriangulation *triangulation, int flavour)
	Creates a new set of normal surface matching equations for the given triangulation using the given flavour of coordinate system.
std::ostream &	operator<< (std::ostream &out, const NPrismSpec &spec)
	Writes the given prism specifier to the given output stream.
std::ostream &	operator<< (std::ostream &out, const NPerm &p)
	Writes a string representation of the given permutation to the given output stream.
NPerm	faceOrdering (int face)
	Returns a permutation mapping (0,1,2) to the vertices of the given tetrahedron face in their canonical order.
NPerm	edgeOrdering (int edge)
	Returns a permutation mapping (0,1) to the vertices of the given tetrahedron edge in their canonical order.
std::string	faceDescription (int face)
	Returns a string representation of the permutation mapping (0,1,2) to the vertices of the given tetrahedron face in their canonical order, as described in faceOrdering().
std::string	faceDescription (const NPerm &facePerm)
	Returns a string representation of the given permutation with only the images of 0, 1 and 2 included.
std::string	edgeDescription (int edge)
	Returns a string representation of the permutation mapping (0,1) to the vertices of the given tetrahedron edge in their canonical order, as described in edgeOrdering().
std::string	edgeDescription (const NPerm &edgePerm)
	Returns a string representation of the given permutation with only the images of 0 and 1 included.
std::ostream &	operator<< (std::ostream &out, const NTriBool &set)
	Writes the given three-way boolean to the given output stream.
std::ostream &	operator<< (std::ostream &out, const NBoolSet &set)
	Writes the given boolean set to the given output stream.
template<class Data, class HashFcn, class EqualTo>
bool	operator== (const NIndexedArray< Data, HashFcn, EqualTo > &array1, const NIndexedArray< Data, HashFcn, EqualTo > &array2)
	See the C++ standard.
template<class Data, class HashFcn, class EqualTo>
bool	operator< (const NIndexedArray< Data, HashFcn, EqualTo > &array1, const NIndexedArray< Data, HashFcn, EqualTo > &array2)
	See the C++ standard.
std::ostream &	operator<< (std::ostream &out, const NLargeInteger &large)
	Writes the given integer to the given output stream.
std::ostream &	operator<< (std::ostream &out, const NRational &rat)
	Writes the given rational to the given output stream.
char *	duplicate (const std::string &str)
	Creates a new C string that is a duplicate of the given C++ string.
bool	startsWith (const std::string &str, const std::string &prefix)
	Determines whether the given C++ string begins with the given prefix.
std::string	stripWhitespace (const std::string &str)
	Strips all whitespace from the beginning and end of the given C++ string.
bool	valueOf (const std::string &str, int &dest)
	Converts the entire given string to an integer and reports whether this conversion was successful.
bool	valueOf (const std::string &str, unsigned &dest)
	Converts the entire given string to an unsigned integer and reports whether this conversion was successful.
bool	valueOf (const std::string &str, long &dest)
	Converts the entire given string to a long integer and reports whether this conversion was successful.
bool	valueOf (const std::string &str, unsigned long &dest)
	Converts the entire given string to an unsigned long integer and reports whether this conversion was successful.
bool	valueOf (const std::string &str, NLargeInteger &dest)
	Converts the entire given string to an arbitrary precision integer and reports whether this conversion was successful.
bool	valueOf (const std::string &str, double &dest)
	Converts the entire given string to a double precision real number and reports whether this conversion was successful.
bool	valueOf (const std::string &str, bool &dest)
	Converts the entire given string to a boolean and reports whether this conversion was successful.
bool	valueOf (const std::string &str, NTriBool &dest)
	Converts the entire given string to a three-way boolean (true, false or unknown) and reports whether this conversion was successful.
bool	valueOf (const std::string &str, NBoolSet &dest)
	Converts the entire given string to a set of booleans and reports whether this conversion was successful.
template<class OutputIterator>
unsigned	basicTokenise (OutputIterator results, const std::string &str)
	Decomposes the given string into tokens.
Variables
const double	epsilon
	A very small positive real designed to accommodate for rounding error.
const int	vertexSplit [4][4]
	Lists which vertex splits split which pairs of vertices.
const int	vertexSplitMeeting [4][4][2]
	Lists which vertex splits meet which edges.
const int	vertexSplitDefn [3][4]
	Lists the vertices which each vertex split splits.
const int	vertexSplitPartner [3][4]
	Lists the second vertex with which each vertex is paired under each vertex split.
const char	vertexSplitString [3][6]
	Contains strings describing which vertices each vertex split splits.
const NPerm	triDiscArcs [4][3]
	Lists in consecutive order the directed normal arcs that form the boundary of each type of triangular normal disc.
const NPerm	quadDiscArcs [3][4]
	Lists in consecutive order the directed normal arcs that form the boundary of each type of quadrilateral normal disc.
const NPerm	octDiscArcs [3][8]
	Lists in consecutive order the directed normal arcs that form the boundary of each type of octahedral normal disc.
const int	edgeNumber [4][4]
	edgeNumber[i][j] is the number of the edge linking vertices i and j in a tetrahedron.
const int	edgeStart [6]
	edgeStart[k] is the vertex of a tetrahedron at which edge k of the tetrahedron begins.
const int	edgeEnd [6]
	edgeEnd[k] is the vertex of a tetrahedron at which edge k of the tetrahedron ends.
const NPerm	allPermsS4 [24]
	Contains all possible permutations of four elements.
const unsigned	allPermsS4Inv [24]
	Contains the inverses of the permutations in array allPermsS4.
const NPerm	orderedPermsS4 [24]
	Contains all possible permutations of four elements in lexicographical order.
const NPerm	allPermsS3 [6]
	Contains all possible permutations of three elements.
const unsigned	allPermsS3Inv [6]
	Contains the inverses of the permutations in array allPermsS3.
const NPerm	orderedPermsS3 [6]
	Contains all possible permutations of three elements in lexicographical order.
const NPerm	allPermsS2 [2]
	Contains all possible permutations of two elements.
const unsigned	allPermsS2Inv [2]
	Contains the inverses of the permutations in array allPermsS2.

---

Detailed Description

Contains the entire Regina calculation engine.

Todo:

Bug: Derive from regina::boost::noncopyable where appropriate.

Todo:

Feature (long-term): Enhance the test suite for the calculation engine.

---

Copyright © 1999-2004, Ben Burton
This software is released under the GNU General Public License.
For further information, or to submit a bug or other problem, please contact Ben Burton (bab@debian.org).