Error message

  • Notice: Undefined variable: _SESSION in tracking_init() (line 27 of C:\xampp\htdocs\rsds\sites\all\modules\rsds\tracking\tracking.module).
  • Warning: file_get_contents(http://user-agent-string.info/rpc/get_data.php?key=free&format=ini&ver=y): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found in UASparser->get_contents() (line 247 of C:\xampp\htdocs\rsds\sites\all\modules\rsds\tracking\UASparser\UASparser.php).
  • Warning: file_get_contents(http://user-agent-string.info/rpc/get_data.php?key=free&format=ini): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found in UASparser->get_contents() (line 247 of C:\xampp\htdocs\rsds\sites\all\modules\rsds\tracking\UASparser\UASparser.php).
  • Warning: file_get_contents(): php_network_getaddresses: getaddrinfo failed: Nieznany host. in get_user_country() (line 23 of C:\xampp\htdocs\rsds\sites\all\modules\rsds\tracking\tracking_functions.inc).
  • Warning: file_get_contents(http://api.hostip.info/?ip=54.81.108.205): failed to open stream: php_network_getaddresses: getaddrinfo failed: Nieznany host. in get_user_country() (line 23 of C:\xampp\htdocs\rsds\sites\all\modules\rsds\tracking\tracking_functions.inc).
  • Notice: Undefined offset: 1 in get_user_country() (line 25 of C:\xampp\htdocs\rsds\sites\all\modules\rsds\tracking\tracking_functions.inc).

Welcome to the RSDS

The RSDS (Rough Set and Database System) is developed from 2002 by the Research Group on 'Rough Sets and Petri Nets', functioning at the University of Rzeszow in cooperation with the International Rough Set Society. The Alphabetical Search gives you the easiest access to our database. Alternatively, you can use the specified search fields included in two kinds of the Advanced Search and in the Ontological Search that offer you an even more detailed search form.

Without specifying a particular search field in the Alphabetical Search, search is performed over all fields. If you wish to refine your original query, you can do so. The newest feature of the RSDS is the Ontological Search, which gives you the opportunity of semantic search.

Of course, you can also still get the TeX description for each result. If you generally prefer to get your search result displayed in TeX instead of RTF format, you can do also. For more information on the RSDS we refer the user to our help section.

"Pawlak Number of the First Kind""Pawlak Number of the Second Kind"