  
  [1X1 [33X[0;0YIntroduction[133X[101X
  
  [33X[0;0YThe  [5XCryst[105X package, previously known as [5XCrystGAP[105X, provides functions for the
  computation with affine crystallographic groups, in particular space groups.
  For  the definition of the standard crystallographic notions we refer to the
  International  Tables  [Hah95],  in  particular  the chapter by Wondratschek
  [Won95],  and  to  the  introductory  chapter  in  [BBN+78].  The  principal
  algorithms used in this package are described in [GEN97].[133X
  
  [33X[0;0YThe present version for [5XGAP[105X 4 has been considerably reworked from an earlier
  version  for  [5XGAP[105X 3.4.4. Most of the porting to [5XGAP[105X 4 has been done by Franz
  Gähler.  Besides  affine crystallographic groups acting from the right, also
  affine crystallographic groups acting from the left are now fully supported.
  Many algorithms have been added, extended, or improved in other ways.[133X
  
  [33X[0;0YOur  warmest thanks go to Max Neunhöffer, whose extensive testing of the [5XGAP[105X
  4 version of [5XCryst[105X in connection with [5XXGAP[105X uncovered several bugs and led to
  many performance improvements.[133X
  
  [33X[0;0Y[5XCryst[105X  is  implemented  in  the  [5XGAP[105X 4  language,  and  runs  on  any system
  supporting  [5XGAP[105X 4.  However,  certain  commands  may  require that other [5XGAP[105X
  packages  such  as  [5XCaratInterface[105X or [5XXGAP[105X are installed. In particular, the
  routines  in  Section [14X2.9[114X  are  likely  to  require  [5XCaratInterface[105X, and the
  function   WyckoffGraph   (see [2XWyckoffGraph[102X  ([14X2.8-9[114X))  requires  [5XXGAP[105X.  Both
  [5XCaratInterface[105X and [5XXGAP[105X may be available only under Unix.[133X
  
  [33X[0;0YThe [5XCryst[105X package is loaded with the command[133X
  
  [4X[32X  Example  [32X[104X
    [4X[25Xgap>[125X [27XLoadPackage( "cryst" ); [127X[104X
    [4X[28Xtrue[128X[104X
  [4X[32X[104X
  
  [33X[0;0YFor  bug  reports,  suggestions and comments please use the issue tracker on
  GitHub:[133X
  
  [33X[0;0Y[7Xhttps://github.com/gap-packages/Cryst/issues/[107X[133X
  
