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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. 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 ...

  4. COVID-19 testing - Wikipedia

    en.wikipedia.org/wiki/COVID-19_testing

    In one study sensitivity was highest at week one (100%), followed by 89.3%, 66.1%, 32.1%, 5.4% and zero by week six since symptom onset. [ 186 ] [ failed verification ] [ 187 ] Sensitivity is also a function of the number of PCR cycles, as well as time and temperature between sample collection and analysis. [ 188 ]

  5. Economic history of the United States - Wikipedia

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

    [5]: 1 The long life expectancy of the colonists was due to the abundant supplies of food and firewood and the low population density that limited the spread of infectious diseases. The death rate from diseases, especially malaria , was higher in the warm, humid Southern Colonies than in the cold New England Colonies .