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  2. 0.999... - Wikipedia

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

    Stylistic impression of the repeating decimal 0.9999..., representing the digit 9 repeating infinitely In mathematics , 0.999... (also written as 0. 9 , 0. . 9 , or 0.(9) ) is a repeating decimal that is an alternate way of writing the number 1 .

  3. Allele frequency - Wikipedia

    en.wikipedia.org/wiki/Allele_frequency

    Allele frequency, or gene frequency, is the relative frequency of an allele (variant of a gene) at a particular locus in a population, expressed as a fraction or percentage. [1] Specifically, it is the fraction of all chromosomes in the population that carry that allele over the total population or sample size.

  4. Branching fraction - Wikipedia

    en.wikipedia.org/wiki/Branching_fraction

    Branching fractions from the P3/2 and P1/2 states in 88 Sr+. In the field of atomic, molecular, and optical physics, a branching fraction refers to the probability of decay to a specific lower-lying energy states from some excited state.

  5. ∆ - Wikipedia

    en.wikipedia.org/wiki/%E2%88%86

    ∆ may refer to: . Triangle (∆), one of the basic shapes in geometry. Many different mathematical equations include the use of the triangle.; Delta (letter) (Δ), a Greek letter also used in mathematics and computer science

  6. 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 ...

  7. Armalcolite - Wikipedia

    en.wikipedia.org/wiki/Armalcolite

    Armalcolite (/ ˌ ɑːr ˈ m ɑː l k ə l aɪ t /) is a titanium-rich mineral with the chemical formula (Mg,Fe 2+)Ti 2 O 5.It was first found at Tranquility Base on the Moon in 1969 during the Apollo 11 mission, and is named for Armstrong, Aldrin and Collins, the three Apollo 11 astronauts.

  8. Venice Cup - Wikipedia

    en.wikipedia.org/wiki/Venice_Cup

    The Venice Cup is a biennial world championship contract bridge tournament for national teams of women. It is contested every odd-number year under the auspices of the World Bridge Federation (WBF), alongside the Bermuda Bowl (open), Wuhan Cup (mixed), and d'Orsi Bowl (seniors).

  9. Human sex ratio - Wikipedia

    en.wikipedia.org/wiki/Human_sex_ratio

    World map of birth sex ratios, 2012. Gray = no data. In a study around 2002, the natural sex ratio at birth was estimated to be within a narrow range of 1.07 to 1.03 males/female.