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  Subcategories   (see also All Sites in this category)
 
  Selected Sites   (see also All Sites in this category)

  1. Tilings (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine
    An extensive annotated list of links to material on tilings. One way to define a tiling is a partition of an infinite space (usually Euclidean) into pieces having a finite number of distinct shapes. Tilings can be divided into two types, periodic and aperiodic, depending on whether they have any translational symmetries. If these symmetries exist, they form a lattice. There has been much recent research on aperiodic tilings (which lack such symmetries) and their possible realization in certain crystal structures. Tilings also have connections to much of pure mathematics including operator K-theory, dynamical systems, and non-commutative geometry. more>>

  2. Wallpaper Groups: The Discontinuous Groups of Rotation and Translation in the Plane - Xah Lee
    An undergraduate tutorial on wallpaper groups, with illustrations of the 17 wallpapers groups and a wallpaper gallery. Technically, the derivation of all discontinuous groups of rotation and translation in the plane. Contents include: Some Theorems on Rotation and Translation; The Discontinuous Groups of Rotation and Translation in the Plane; Derivation and Classification of Groups; Appendix: The 17 Wallpaper Groups (with a Wallpaper gallery); and References and Related Web Sites. Hosted by the Math Forum. more>>


 

Mason error

 
component stack:   /library/branch.html
/library/dhandler
code stack:   /var/lib/mason/obj/library/branch.html:208
/usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Commands.pm:70
/var/lib/mason/obj/library/dhandler:90

debug info:   Debug file is '/var/lib/mason/debug/anon/8'.

raw_error





























raw error:
 






























error while executing /library/branch.html:
Server message number=1105 severity=17 state=4 line=1 text=Can't allocate space for object 'syslogs' in database 'catalog' because 'logsegment' segment is full/has no free extents. If you ran out of space in syslogs, dump the transaction log. Otherwise, use ALTER DATABASE or sp_extendsegment to increase size of the segment.
Statement=INSERT INTO keystorage ( keys ) VALUES ( '62434;67023;17034;74527;76795;10856;17702;12146;5246;75464;72833;6895;12274;63226;5647;9568;67615;74898;4303;74940;67567;64227;4862;74528;68050;75373;16276;70214;7546;16351;17074;8855;73459;75407;12317;76835;6...
HTML::Mason::Interp::__ANON__('Server message number=1105 severity=17 state=4 line=1 text=Can\'...') called at /usr/lib/perl5/site_perl/5.6.0/Forum/Key.pm line 284
Forum::Key::store(undef, 'topics', 'Forum::Key=HASH(0x8fc2914)') called at /var/lib/mason/obj/library/branch.html line 208
HTML::Mason::Commands::__ANON__('passed_args', 'HASH(0x8f61530)', 'tree', 'topics', 'branch', 'transform_g') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Component.pm line 131
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x8f67008)', 'passed_args', 'HASH(0x8f61530)', 'tree', 'topics', 'branch', 'transform_g') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
HTML::Mason::Request::comp('HTML::Mason::Request::ApacheHandler=HASH(0x8f67d04)', '/library/branch.html', 'passed_args', 'HASH(0x8f61530)', 'tree', 'topics', 'branch', 'transform_g') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Commands.pm line 70
HTML::Mason::Commands::mc_comp('/library/branch.html', 'passed_args', 'HASH(0x8f61530)', 'tree', 'topics', 'branch', 'transform_g') called at /var/lib/mason/obj/library/dhandler line 90
HTML::Mason::Commands::__ANON__('start_at', 1, 'num_to_see', 50, 'keyid', 39014268) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Component.pm line 131
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0x8f615d8)', 'HTML::Mason::Component::FileBased=HASH(0x8f615d8)', 'HTML::Mason::Component::FileBased=HASH(0x8f615d8)', 'start_at', 1, 'num_to_see', 50, 'keyid', ...) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 653
HTML::Mason::Request::comp('HTML::Mason::Request::ApacheHandler=HASH(0x8f67d04)', 'HASH(0x8f65100)', 'HTML::Mason::Component::FileBased=HASH(0x8f615d8)', 'start_at', 1, 'num_to_see', 50, 'keyid', ...) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 159
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/Request.pm line 159
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0x8f67d04)', '/library/topics/transform_g', 'start_at', 1, 'num_to_see', 50, 'keyid', 39014268) called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/ApacheHandler.pm line 914
HTML::Mason::ApacheHandler::handle_request_1('HTML::Mason::ApacheHandler=HASH(0x8de2bfc)', 'Apache=SCALAR(0x8e01b88)', 'HTML::Mason::Request::ApacheHandler=HASH(0x8f67d04)', 'HASH(0x8fbbe70)') called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/ApacheHandler.pm line 560
require 0 called at /usr/lib/perl5/site_perl/5.6.0/HTML/Mason/ApacheHandler.pm line 560
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0x8de2bfc)', 'Apache=SCALAR(0x8e01b88)') called at /etc/httpd/conf/handler.pl line 97
HTML::Mason::handler('Apache=SCALAR(0x8e01b88)') called at /dev/null line 0
require 0 called at /dev/null line 0