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  2. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    The Archimedean property: any point x before the finish line lies between two of the points P n (inclusive).. It is possible to prove the equation 0.999... = 1 using just the mathematical tools of comparison and addition of (finite) decimal numbers, without any reference to more advanced topics such as series and limits.

  3. Receiver operating characteristic - Wikipedia

    en.wikipedia.org/wiki/Receiver_operating...

    A classification model (classifier or diagnosis [7]) is a mapping of instances between certain classes/groups.Because the classifier or diagnosis result can be an arbitrary real value (continuous output), the classifier boundary between classes must be determined by a threshold value (for instance, to determine whether a person has hypertension based on a blood pressure measure).

  4. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...

  5. Network motif - Wikipedia

    en.wikipedia.org/wiki/Network_motif

    Therefore, the two concepts F 2 and F 3 restrict the usage of elements of the graph, and as can be inferred, the frequency of a sub-graph declines by imposing restrictions on network element usage. As a result, a network motif detection algorithm would pass over more candidate sub-graphs if we insist on frequency concepts F 2 and F 3.

  6. Doctor Who - Wikipedia

    en.wikipedia.org/wiki/Doctor_Who

    Doctor Who follows the adventures of the title character, a rogue Time Lord with somewhat unknown origins who goes by the name "the Doctor".The Doctor fled Gallifrey, the planet of the Time Lords, in a stolen TARDIS ("Time and Relative Dimension(s) in Space"), a time machine that travels by materialising into, and dematerialising out of, the time vortex.

  7. Economic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_the...

    Canals' shipping costs were between two and three cents per ton-mile, compared to 17–20 cents by wagon. [7] The cost of constructing a typical canal was between $20,000 and $30,000 per mile. [9]: 53 Only 100 miles of canals had been built in the U.S. by 1816, and only a few were longer than two miles.