Co-NP-complete
In complexity theory, the complexity class Co-NP-complete is the set of problems that are the hardest problems in Co-NP, in the sense that they are the ones most likely not to be in P. If you can find a way to solve a Co-NP-complete problem quickly, then you can use that algorithm to solve all Co-NP problems quickly.A more formal definition: A decision problem C is Co-NP-complete if it is in Co-NP and if every problem in Co-NP is many-one reducible[?] to it. This means that for every Co-NP problem L, there exists a polynomial time algorithm which can transform any instance of L into an instance of C with the same truth value. As a consequence, if we had a polynomial time algorithm for C, we could solve all Co-NP problems in polynomial time.
Each Co-NP-Complete problem is the complement of an NP-complete problem. The two sets are either equal or disjoint. The latter is thought more likely, but this isn't known. See Co-NP and NP-complete for more details.
changed their URLs for some re/re.html">re/reason.html">reason. For example, a magazine
them monthly with new stories. If a user.html">user wanted to find an
access.html">access it if not for Google's cached version.
between a user and another Web page. When using a proxy.html">proxy.html">proxy.html">proxy server,
from the URL of the proxy server. One type of proxy service is
anonymizer when they do not want the Web site they are visiting
accessing the site, or to leave "cookies" on their browser.
content from one language to another. Rather than directly
can instead indirectly access the page via a proxy server
As noted above, filtering companies often block.html">block loophole
practice of blocking.html">blocking loophole sites necessarily results in a
the pages that are cached, for example, do not contain content
Filters that do not block these loophole sites, however, may.html">may
thus resulting in substantial underblocking.
After Their Initial categorization.html">Categorization
subsequent reviews of categorized sites or pages on a scheduled
sites and pages, rather than on re-reviewing already categorized
previous categorization of a Web site is not re-reviewed for
the Web site was previously categorized as a whole, the new pages
the blocking product vendor. This necessarily results in both
Web pages and Web sites changes relatively rapidly.
rapidly, Web sites themselves may disappear and be replaced by
associated with a particular Web site is blocked under a
the IP address likely would be reassigned to a different Web
organization, such as the American Registry for Internet Numbers,
the reassigned IP address would likely be miscategorized.
.
On
wordlookup.net
All is still licensed under the GNU FDL.
It uses material from the wikipedia.
|
|